Cherry (Sweet) in Zone 9 -- plant

Bloom timing & cross-pollination

Cherry (Sweet)s need a partner

A lone cherry (sweet) tree sets little or no fruit. Cherry (Sweet) flowers need pollen from a different variety, carried by bees, and the two trees have to bloom at the same time to trade it. Plant a second variety whose bloom window overlaps, within about 50 feet.

Stella blooms mid season. 2 varieties overlap and can pollinate it: Bing, Rainier.Best pick: Rainier, the strongest bloom overlap of the group.

Bar length shows how long each variety blooms, roughly 8 to 14 days. Bars that overlap can cross-pollinate.

▲ Tap a variety to see its pollination partners

Very early Early Mid Late Very late

Bing✓ partner

Stella✓ partner

Lapins✓ partner

Sweetheart✓ partner

Rainier✓ partner

Black Tartarian✓ partner

Royal Lee✓ partner

Minnie Royal✓ partner

The pollination rule

Plant a second compatible variety unless you pick a self-fertile one. Most sweet cherries cannot pollinate themselves, so a single Bing tree gives no cherries at all. The second tree has to be a different, compatible variety that blooms at the same time, planted within about 100 feet so bees can carry pollen between them (watch out: Bing, Lambert, and Royal Ann cannot pollinate each other). The easy way around all of this is to plant a self-fertile variety like Stella, Lapins, or Sweetheart, which fruits on its own and can also pollinate most other cherries. Bees carry the pollen, so you want lots of bee activity during the short bloom.Plant a second compatible variety unless you choose a self-fertile one. Most sweet cherries are self-incompatible: a lone Bing sets no crop. Compatibility is governed by S-alleles, so the pollinizer must be in a DIFFERENT incompatibility group AND bloom at the same time (the classic trap is that Bing, Lambert, and Royal Ann/Napoleon are all cross-incompatible and cannot pollinize one another). The self-fertile cultivars (Stella, Lapins, Sweetheart, Skeena, Black Gold, White Gold, Compact Stella) fruit alone and serve as universal pollinizers for most self-sterile varieties of matching bloom. Bees do the work, so strong bee activity during the short bloom is essential for set.

In a pot

Yes, on a dwarf rootstock, 25 gallons and up

Sweet cherry really wants to grow in the ground, and a pot is the workaround only if you lack the space. It can be done on a dwarfing rootstock like Gisela 5, but expect more hands-on care, a smaller crop, and more cracking from the wet-dry swings a pot brings. Pick a self-fertile dwarf cherry so you do not also need a second pollinizer tree, use the biggest, best-draining pot you can, and plan to net it against birds.Sweet cherry is fundamentally a ground tree; a container is a compromise for growers short on space. It works on a genetic-dwarf or Gisela 5 tree, but expect more management, lighter crops, and more cracking from the rapid wet-dry cycling of a pot. Favor a self-fertile dwarf cultivar to avoid needing a second pollinizer, give it the largest practical, freely draining pot, and net it at color change against birds.

Pot size: 25 gallons and up
Watering: A cherry in a pot dries out much faster than one in the ground. In summer heat, check it daily and water when the top inch or two feels dry, until water runs out the bottom, but never let the pot sit in a saucer of water, since wet roots rot. The catch is that cherries crack from uneven watering, so a pot, which swings wet and dry fast, makes cracking more likely, another reason a ground tree is easier. In winter, give just enough to keep the root ball from drying out completely.A potted cherry dries far faster than one in the ground and has no deep soil to buffer it, so check moisture daily in summer heat and water when the top inch or two is dry, until it runs from the drainage holes, but never leave the pot in a full saucer. The hard part is that cherry cracks on uneven moisture and a pot swings wet-to-dry fastest, so consistency is doubly important. Through dormancy, water only enough to keep the root ball from drying completely.
Self-watering pot: No. A self-watering or sub-irrigated planter is not recommended for cherry. Its reservoir keeps the lower root zone continuously moist, exactly the condition that triggers root and crown rot in stone fruit and predisposes the tree to bacterial canker. Cherry needs a freely draining pot and a wet-then-dry cycle, not a constant water table.
Mix: Use a coarse, fast-draining soilless mix built for woody plants, not a peat-heavy potting soil. A bark-based mix (composted pine bark with perlite or pumice) gives the air-filled porosity stone-fruit roots demand; cherry will not tolerate a mix that holds water against the crown. Skip native soil in a pot, which compacts under irrigation. Keep amendments minimal and drainage-first: blend in extra perlite or pumice if the base mix feels water-retentive, and top-dress with a thin layer of compost rather than mixing heavy organics throughout. Avoid moisture-retentive crystals or large peat fractions, which work against the fast-draining root zone cherry needs.
Feeding: Frequent watering flushes nutrients from a pot, so feed lightly and often: a dilute balanced liquid feed every few weeks through the spring-to-early-summer flush, then stop so no soft growth is pushed into fall. Do not feed at planting, and ease off entirely once the tree goes dormant.

One to plant on

Gisela 525 gal pot. A small, dwarfing rootstock about half the size of a Mazzard tree, very cold-hardy, and quick to fruit (in 2 to 3 years), even in heavier soil. It can set so much fruit so young that the cherries come out small unless you feed it well and thin, but it makes the easiest tree to cover and pick.25 gal pot. A true dwarfing rootstock, roughly half the size of Mazzard, very precocious (bears in 2 to 3 years) and very cold-hardy, doing well even on heavier soils. The catch is crop-load management: it sets so heavily so young that fruit can be small and the tree overcropped without thinning and good feeding. The best choice for a small, nettable backyard tree.

Winter

Roots in a pot get much colder than roots in the ground, because cold reaches the soil from every side. A cherry that survives winter fine in your yard can still freeze its roots in a pot. Before hard freezes, either bury the pot to its rim in a garden bed, or move it to an unheated but sheltered spot (an attached garage or shed) that stays cold but not deep-freezing. The tree still needs the winter chill to rest and bloom, so do not bring it into a warm room.Roots in a pot sit several zones colder than roots in the ground, so a cherry hardy in your ground may still freeze its roots in a container, and sweet cherry is already among the less cold-hardy fruit trees. Before hard freezes, either sink the pot to its rim in a bed or move it to an unheated but sheltered space that holds dormancy without the deep lows. The tree still needs its winter chill, so do not overwinter it in a heated room.

Cold protection in a pot is about more than the roots: the exposed trunk and the graft union are vulnerable to freeze and to winter sun-scald, and sweet cherry's thin bark is canker-prone where injured. Wrap or shade the lower trunk in exposed sites, and bank mulch or sink the pot to insulate the root zone. The goal is a cold, stable dormancy without the deep lows that kill exposed roots; a too-warm shelter that breaks dormancy early leaves the tree to bloom into frost.

Hardy to zone 5 in the ground; roots in a pot sit colder than that.

Pot safety

Ask what your balcony or roof can carry

A balcony or roof can only hold so much weight. Before you set heavy pots there, ask a building architect what it can safely carry.Illinois Extension's guidance is to consult a building architect about weight limits before placing heavy pots on a balcony or rooftop garden. It gives no weight figure.

Never grow food in a container with anything toxic in it

Many kinds of containers can be used. Whatever you choose, keep anything toxic out of it, especially if you are growing food.Colorado State accepts nearly any container material but warns against using a container that holds toxic materials, especially for edible plants. Illinois adds that a vegetable container should be free of chemicals toxic to plants or people, and urges caution with treated lumber when growing food. If you cannot account for what a repurposed container once held, that alone is a reason to keep food out of it.

Secure hanging containers well

Fasten hanging baskets and window or rail boxes securely. Think about what is below them too, since they can drip on people or things underneath.Illinois Extension asks growers to secure hanging containers well and to think through the safety issues of hanging them. Placement matters too, since a hanging container can drip onto people or belongings below.

Soil chemistry

Soil pH for cherry (sweet)

Preferred

6.5 to 7

Tolerated

6 to 7.5

Sweet cherry grows best in a near-neutral soil, around pH 6.5 to 7.0, and is fine from about 6.0 to 7.5 (pH just measures how acidic or alkaline the soil is). Test your soil before planting and adjust slowly if needed: garden lime raises the pH if the soil is too acidic, and elemental sulfur lowers it if it is too alkaline. Mix any of this in before you plant, because pH changes slowly and is far easier to fix before the permanent tree goes in.Sweet cherry does best in a near-neutral soil, roughly pH 6.5 to 7.0, and tolerates about 6.0 to 7.5. Test the soil before planting and adjust gradually if needed: lime raises a too-acidic pH, elemental sulfur lowers one that is too alkaline. Work amendments in ahead of planting, since pH shifts slowly and is far easier to correct before the permanent tree is in the ground.

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Steady hand on the hose

Watering

When & how much

Frequency

Water deeply now and then instead of a little every day. Plan on about once or twice a week while a young tree is getting established, easing to about once a week for a fruiting tree in summer heat, adjusting for rain and your soil. The big thing with cherries is to keep the water STEADY: if the soil dries out and then gets a lot of water, the cherries split open. In winter, when the tree is resting, it needs very little and rain usually covers it.Water deep-and-infrequent rather than little-and-often: about once or twice a week while a young tree establishes, easing to roughly weekly for a bearing tree in summer heat, always adjusted for rain and soil. The discipline that matters for cherry is EVEN moisture: a dry-then-wet swing, or rain after a dry spell, drives the fruit to crack. Through winter dormancy water need drops sharply and rainfall usually suffices.

Amount

Each time you water, give a deep soak that reaches all the way down to the roots, not just a splash on top. A young tree wants about 5 gallons per soak. An older, fruiting tree wants roughly an inch of water a week through the season, and more when it is hot. Keeping the water even and steady as the cherries color up is what keeps them from splitting.Water deeply each time so moisture reaches the full root zone, not just the surface. For an establishing tree, on the order of 5 gallons per soak; for a bearing tree, roughly the equivalent of an inch of water per week through the season, more in heat. Steady, deep watering as the fruit colors keeps the cherries from cracking; let the soil swing dry then wet and you invite splitting.

Method

Water at the ground around the roots with a drip line or soaker hose, and keep the leaves and fruit dry. Spraying water over the top wets the leaves and fruit and helps diseases like brown rot and leaf spot, and water sitting on ripe cherries makes them split, so put the water on the soil, not the tree, and never sprinkle a tree full of ripe cherries.Water at the root zone by drip or soaker and keep the canopy and fruit dry. Overhead watering that wets the leaves and fruit prolongs leaf wetness, feeds brown rot, bacterial canker, and leaf spot, and leaves free water on ripe fruit that drives cracking, so deliver water to the soil, not the tree, and never sprinkle a tree carrying ripe cherries.

Signs of trouble

Too much water

Too much water, or soil that drains poorly, shows up as yellowing leaves, wilting that does not go away even when the soil is wet, and a tree that slowly goes downhill, because the roots cannot breathe. In cherry, soil that stays wet also brings on crown and root rot and the serious disease bacterial canker. Soil that never dries out between waterings is your warning to back off.Overwatering and poor drainage show as yellowing leaves, wilting that persists even in wet soil, and a declining tree, since waterlogged cherry roots suffocate. Chronically wet soil also brings on crown and root rot and predisposes the trunk to bacterial canker, both often fatal. Soil that never dries between waterings is the warning sign to act on.

Too little water

Too little water shows as wilting, dull curling leaves, slower growth, and leaves dropping early in a long dry spell. The tricky part with cherries is near harvest: if the tree dries out and then gets rain or a big watering, the nearly ripe cherries split. So keep the water steady and do not let the tree swing from dry to soaked while the fruit is ripening.Underwatering shows as wilting, dull curling leaves, slowed shoot growth, and early leaf drop in a long dry spell. The cruel twist with cherry is at harvest: a tree run dry and then rained on, or deep-watered after drought, splits its nearly ripe fruit. Catch the dry stress before the swing, and keep moisture even through the final swell.

Feeding rhythm

Feeding

Frequency

1x per year

Type

balanced granular (e.g. 10-10-10)

When to start

early spring before bud break

Feed once in early spring before the tree starts growing. Scatter the fertilizer evenly on the soil around the tree out to where the branches reach, keep it off the trunk, and water it in. Sweet cherry needs less feeding than peach, so go light: if the tree is making plenty of new growth, it may need none at all. Never feed late in the year, because soft late growth gets damaged by winter cold, and that damage is how the serious disease bacterial canker gets in.Feed lightly in early spring before growth begins, broadcasting evenly around the root zone out to the drip line, off the trunk, and watering it in. Sweet cherry needs less nitrogen than peach: aim for about 8 to 12 inches of new shoot growth a year on a bearing tree, and ease off if it makes more. Never feed late in the season, since late nitrogen pushes soft growth that winter cold injures, and that injury is the main entry point for bacterial canker.

N · P · K = 10-10-10

A balanced fertilizer like 10-10-10 (the three numbers are nitrogen, phosphorus, and potassium) works for backyard cherries, used sparingly. Do not overdo nitrogen, the first number, because too much pushes leafy growth that is more prone to disease and winter damage.A balanced ratio such as 10-10-10 suits backyard cherries, applied modestly. Avoid high-nitrogen feeding, which drives soft, canker-prone, overly vigorous growth at the expense of fruiting and winter hardiness.

Try 10-10-10 balanced fertilizer

Who grows well together

Companion planting

The most important companion for a sweet cherry is another cherry: plant a second compatible variety blooming at the same time unless you pick a self-fertile one (like Stella, Lapins, or Sweetheart), because most sweet cherries cannot pollinate themselves and a lone tree gives no fruit. Beyond that, what matters for a tree is the root zone, not the usual vegetable pairings: keep grass and weeds pulled back from under the branches, since lawn competes hard with a young tree, and a mulched, weed-free area helps it settle in. The one site rule is replant disease: do not plant a cherry where another cherry, plum, peach, or apricot was recently growing. For sweet cherry the decisive companion is a compatible pollinizer: most cultivars are self-incompatible, so a second variety of a different S-allele group with overlapping bloom is required unless the variety is self-fertile. Past pollination, the interactions that matter are at the root zone, not classic vegetable companions: keep turf and weeds cleared back from under the canopy, since they compete hard with a young tree, and a mulched, competition-free root area establishes it faster. The one site rule is replant disease: do not follow stone fruit with stone fruit on the same ground.

Other

A compatible pollinizer cherry (or a self-fertile variety)

The most important plant to put near a sweet cherry is another cherry. Most cultivars are self-incompatible and set NO crop alone, so a self-sterile variety (Bing, Rainier, Lambert) needs a second variety of a different incompatibility group blooming at the same time, ideally within about 100 feet for good bee transfer. The self-fertile cultivars (Stella, Lapins, Sweetheart, Skeena, Black Gold) sidestep this, fruiting alone and serving as universal pollinizers for most others. Confirm bloom overlap, not just the presence of a second tree. Research-backed

Keep apart from

Other stone fruit in old stone-fruit ground Replanting a cherry, or any stone fruit, into ground that recently grew peaches, plums, apricots, or cherries is a documented mistake. Old stone-fruit ground carries elevated ring-nematode populations and the replant-disease complex, and nearby infected trees can harbor bacterial canker and the cherry-specific X-disease (leafhopper-spread). Plant in fresh ground, or replace a generous soil volume and remove any infected neighboring trees first; rotating to a different SITE, not just a different variety, is the fix. Research-backed

Provenance tagged inline · see methodology for the labeling system Key

Harvest signals

When to pick

A sweet cherry is ripe when it has turned its full color (dark red to almost black for most types, or a yellow-and-red blush for Rainier), feels firm but gives a little, and tastes sweet. Unlike a peach, a cherry will not get sweeter after you pick it, so taste one first and only pick when they are fully colored and sweet. Pick with the stems attached, and pull from the little woody spur rather than yanking the fruit, so you do not strip next year's fruiting spurs. Pick as soon as they are ripe, because rain splits ripe cherries and birds and small vinegar flies move in quickly.A sweet cherry is ready when it reaches full, deep variety color (dark mahogany to near-black for Bing-type cultivars, full yellow-and-red blush for Rainier), the flesh is firm but gives slightly, and the sugars have peaked. Cherries do NOT ripen further off the tree, so taste-test before picking and leave them until fully colored and sweet. Pick with the stems on, pulling from the spur, not the fruit, to protect next year's fruiting spurs. Pick promptly once ripe: a rain on ripe fruit cracks it, and birds and spotted wing drosophila find a ripe crop fast.

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Yield

What to expect

A grown sweet cherry gives roughly 30 to 50 pounds on a small dwarf tree and 50 to 100 pounds or more on a bigger tree, as long as it gets pollinated, dodges frost, and is protected from birds and rain. The crop depends far more on frost, pollination, birds, and harvest-time rain than on how much you feed it.A mature sweet cherry yields widely by tree size: roughly 30 to 50 pounds on a dwarfing rootstock (Gisela 5) and 50 to 100-plus pounds on a semi-dwarf to standard tree, given a pollinizer, frost-free bloom, and protection from birds and cracking. Crop is far more limited by frost, pollination, birds, and harvest rain than by feeding.

A sweet cherry hits full production around years 6 to 7, or as early as years 3 to 4 on a quick-bearing dwarf rootstock, and keeps producing for decades. Remember a self-sterile variety gives nothing without a partner tree, so make sure you have one.Trees reach full bearing around years 6 to 7 (sooner, years 3 to 4, on a precocious Gisela rootstock) and stay productive for decades. A self-sterile variety yields nothing without a compatible pollinizer, so confirm that first. Do not expect cherries the first year or two. If a little fruit forms early, pick it off so the young tree builds roots and a strong trunk. Your first real harvest usually comes in years 3 to 5 (sooner on a quick-bearing dwarf rootstock), with full crops by years 6 to 7.Expect no crop in the planting year and little to none through year 2 or 3. Remove any early fruit so the tree builds roots and a strong central leader; the first meaningful harvest typically comes in years 3 to 5, sooner on a precocious dwarfing rootstock, with full bearing by years 6 to 7.

What changes yield

a compatible pollinizer (or a self-fertile variety)late-frost damage at bloomwinter chill accumulationbird protection (netting)harvest-time rain and fruit crackingcherry fruit fly and spotted wing drosophila controlrootstock and tree age

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Off the vine

Storing your harvest

Room temp

Sweet cherries do not get sweeter after picking and go downhill quickly on the counter, so eat them the day you pick or refrigerate them. If you do leave them out, keep them out of the sun and leave the stems on so they keep a little longer.Sweet cherries are best eaten soon after picking; they do not ripen further off the tree and lose quality fast at room temperature. Hold them at room temperature only for the day you pick, out of direct sun, and keep the stems on to slow moisture loss and decay.

Fridge

Put cherries in the fridge unwashed with the stems still on, in a loose bag or open container, and they keep about 5 to 10 days. Cold actually helps cherries (unlike peaches), so the coldest part of the fridge is best. Wash them only right before you eat them, because water on them in storage makes them rot faster.Refrigerate cherries unwashed, stems on, in a breathable container or loosely bagged, and they hold about 5 to 10 days. Cold is their friend, unlike peaches: cherries do not suffer chilling injury and keep best near 32°F at high humidity. Wash only just before eating, since surface moisture in storage speeds rot.

Freezer

Cherries freeze nicely. Wash and dry them, take out the pits (this keeps an off taste from developing), spread them on a tray to freeze, then pack them into freezer bags. They keep for several months and are great for baking, sauces, and smoothies.Cherries freeze well. Wash, dry, and pit them (pitting prevents an almond-like off flavor), then freeze in a single layer on a tray before bagging. Frozen cherries keep their quality for several months and are excellent for baking, sauces, and smoothies.

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When something goes wrong

Common problems

The tree flowered but I got almost no cherriesThe tree bloomed well but set little or no fruit

01 of 04

What happened The tree flowered but barely fruited. On sweet cherry the usual reason is pollination: most kinds cannot pollinate themselves, so a single self-sterile tree like Bing makes no fruit without a matching partner tree blooming at the same time. The next reason is a late frost on the early flowers, and after that, cold or rainy weather that kept the bees home. The fix is to plant a self-fertile variety or a proper partner, choose a spot less prone to frost, and have bees active at bloom.The tree flowered heavily but few or no cherries formed. On sweet cherry the leading cause is POLLINATION: most cultivars are self-incompatible, so a lone self-sterile tree (Bing, Rainier, Lambert) sets nothing without a compatible pollinizer of overlapping bloom. The next cause is a late frost on the early open bloom, and a distant third is cold, wet, windy bloom weather that kept bees from flying. The fix is a self-fertile variety or a properly matched pollinizer, a frost-aware site, and bee activity at bloom. Next season Plant a self-fertile variety, or make sure a matching partner cherry blooms at the same time nearby; avoid low frosty spots and keep a cover handy for bloom-time frosts.Plant a self-fertile cultivar, or confirm a cross-compatible pollinizer blooms at the same time within about 100 feet; avoid frost-pocket sites and keep a cover ready for bloom.

The cherries split open just before I could pick themRipe cherries split open near harvest

02 of 04

What happened The nearly ripe cherries cracked and split, usually after rain. This is the classic sweet cherry problem: rain, dew, or fog sitting on ripe fruit soaks into the skin and the fruit swells and splits, and letting the soil go dry then wet makes it worse. Split cherries then rot quickly. The fixes are keeping the watering even, picking before a coming rain, and growing crack-resistant kinds like Lapins.Nearly ripe cherries developed splits and cracks, often after a rain. This is the signature sweet-cherry failure: free water on ripe fruit, from rain, heavy dew, or fog, is absorbed through the skin and the swelling flesh splits, and a dry-then-wet soil swing makes it worse. Split fruit then rots fast with brown rot. The fixes are even soil moisture through the final swell, picking ahead of forecast rain, and choosing crack-resistant cultivars like Lapins. Next season Keep the watering steady as the fruit ripens, pick before a coming rain, and grow crack-resistant kinds like Lapins; never spray water over a tree full of ripe cherries.Keep soil moisture even through ripening, pick ahead of forecast rain, and favor crack-tolerant cultivars (Lapins, Sweetheart); never sprinkle a tree carrying ripe fruit.

Birds ate the cherries before I couldBirds stripped the crop as it ripened

03 of 04

What happened The cherries were pecked or gone, often within a day or two of coloring. Birds love ripe cherries and can clean off an unprotected tree faster than any bug. No spray or scare gadget reliably keeps them off, but a net does. The fix is to keep the tree small enough to cover and net it as soon as the fruit starts to color, before the birds find it.The ripening crop was pecked or stripped, often within a day or two of coloring. Birds (robins, starlings, waxwings, jays) target ripe cherries and can clear an unprotected tree faster than any insect pest. There is no spray or scare device that reliably keeps them off; physical exclusion does. The fix is to keep the tree small enough to net and to net it at first color, before the birds discover it. Next season Pick a dwarfing rootstock so the tree stays small enough to cover, and put fine bird netting over the whole tree as the fruit starts to color, tucking it in at the bottom.Choose a dwarfing rootstock so the tree can be netted, and drape fine bird netting over the whole canopy at first color, securing the skirt.

The cherries had little white worms insideCherries had small white maggots inside

04 of 04

What happened Cherries that looked okay outside had small white maggots inside. Two pests cause this: the cherry fruit fly (one round a year, hitting fruit as it colors) and spotted wing drosophila (which hits whole ripe fruit and multiplies fast). Both are handled by picking promptly and completely, removing every dropped cherry, getting the crop into the fridge right away, and using traps to time any organic spray.Cherries that looked fine outside hid small white maggots inside. Two pests do this: the western cherry fruit fly (one generation a year, attacking fruit as it colors from straw to blush) and spotted wing drosophila (which attacks sound ripe fruit and multiplies explosively). Both are managed by prompt, complete harvest, removing every dropped and culled fruit, chilling the crop immediately, and trapping to time any organic spray to the color-change window. Next season Put up traps in mid-spring, pick every cherry promptly, destroy all fallen fruit so the maggots cannot get into the soil, and refrigerate the crop right away.Hang traps from mid-spring, pick promptly and completely, destroy all dropped and culled fruit so larvae cannot reach the soil, and chill the crop immediately.

The usual suspects

Pests & diseases

Pests

Western cherry fruit fly

P · 01

Symptoms Cherries that look normal on the outside but have a small white maggot (a grub) inside, usually near the pit, with brown mushy flesh around it. You often do not see it until you cut or bite a cherry. It shows up as the fruit turns from pale to a pink-blush color.Cherries that look fine outside but hide a small white maggot inside, often near the pit, with the flesh browning around it. Infested fruit may soften or show a tiny egg-laying dimple. Damage appears as the fruit colors from straw to salmon-blush and worsens toward harvest. Cause A small fly called the western cherry fruit fly. It spends winter in the soil, comes out in late spring, and lays eggs under the skin of cherries once they start to color. The eggs hatch into the maggots you find inside. There is just one round a year, and green fruit is safe, so the danger starts at color change.The western cherry fruit fly (Rhagoletis indifferens), a small fly with banded wings. Pupae overwinter in the soil; adults emerge from late spring, and after a 5-to-7-day maturation the females lay eggs just under the skin of coloring fruit. There is one generation a year, and green fruit is safe, so timing tracks the color change. Organic treatment Once the maggots are inside, no spray reaches them. The fixes are cleanup and timing: pick every cherry promptly (do not leave any), pick up and destroy fallen fruit so the grubs cannot reach the soil, and put landscape fabric or thick mulch under the tree so they cannot burrow in. A yellow sticky trap put up in mid-May tells you when the flies arrive so you can spray an organic product at the right moment.There is no rescue once maggots are inside the fruit. The backyard controls are sanitation and timing: pick all fruit promptly and completely (leave none to drop), gather and destroy dropped cherries so larvae cannot reach the soil, and lay landscape fabric or dense mulch under the tree to block pupation. Yellow sticky traps from mid-May time any organic spray to 5 to 7 days after the first fly is caught. Prevention Cleanup is the main thing: never leave wormy or fallen cherries on the ground, because each maggot that gets into the soil becomes next year's fly. Picking the tree clean every year and keeping the ground tidy keeps the numbers down.Sanitation is the backbone: never let infested or dropped fruit sit, since each maggot that reaches the soil is next year's fly. Prompt, complete harvest and a clean orchard floor steadily lower pressure. A single isolated tree picked clean every year can stay nearly fly-free.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Prompt harvest

Pick the tree out as the cherries ripen and do not leave stragglers hanging or lying underneath. Once a maggot, the small white grub, is inside a cherry, nothing you spray reaches it, so getting the fruit off on time is the part of this you control.Timely, thorough picking is half of the backyard program, since fruit already carrying larvae cannot be rescued. Keeping one isolated tree picked out each season holds it close to clean year over year.
Garden sanitation

Gather up the fallen cherries and destroy them instead of leaving them on the ground. Each grub that reaches the soil becomes one of next spring's flies, so a clean orchard floor is what drives the numbers down season by season.Larvae exit dropped fruit to pupate in the soil, so collecting and destroying drops before they can leave the fruit is the step that lowers local pressure. Laying a solid ground barrier under the canopy to block pupation is the companion move the source names.
Yellow sticky traps

Hang a yellow sticky card in the tree from about the middle of May. It will not control the flies on its own; what it gives you is the date the first one shows up, and the risky stretch opens roughly 5 to 7 days after that, as the fruit turns from straw to a pink blush.Yellow sticky traps hung from mid-May detect adult emergence, and the 5 to 7 day maturation before egg-laying is what any timed treatment hangs off, so the first-catch date is the datum worth recording. Monitoring to time the other steps, not control in itself. Green fruit is not at risk, so the trap and the color change track the same window.

No spray for this one. Prevention is the control.

Spotted wing drosophila

P · 02

Symptoms Ripe cherries that go soft, dimpled, and leaky fast, with tiny white maggots inside, and fruit that ferments and smells sour on the tree. The difference from ordinary fruit flies is that this pest attacks whole, undamaged ripe cherries.Soft, sunken, leaking spots on ripe and ripening fruit, with tiny white larvae inside that collapse the flesh within a day or two; fruit ferments and sours on the tree. Unlike common vinegar flies, this one attacks SOUND, intact ripe fruit, not just damaged fruit. Cause A small invasive fly called spotted wing drosophila. Unlike normal fruit flies, the female can cut into whole, healthy ripe cherries to lay her eggs, which hatch into the maggots inside. It multiplies very fast, so it gets worse the longer ripe fruit hangs.Spotted wing drosophila (Drosophila suzukii), an invasive vinegar fly whose females have a saw-like ovipositor that cuts into intact ripe fruit to lay eggs. It builds explosively, completing a generation in as little as a week, so pressure climbs steeply through the harvest window. Organic treatment Picking is the control: harvest ripe cherries every couple of days, remove any overripe or fallen fruit, and get the crop into the fridge quickly, since cold stops the maggots. Fine netting and quick, complete picking are the practical home tools.Harvest is the control: pick ripe fruit promptly and completely, removing culls and any overripe or dropped cherries, and refrigerate the crop right away (cold stops the larvae). Pick every two to three days during ripening. Fine netting and prompt clean-picking are the practical backyard tools; traps with apple-cider-vinegar bait track activity. Prevention Keep ahead of it by never leaving ripe or rotting cherries on the tree or ground, picking often, and chilling the fruit right away. It uses lots of other plants too, so keeping your whole yard's ripe fruit picked up helps.Lower pressure by never leaving ripe or rotting fruit on the tree or ground, picking on a tight schedule, and chilling fruit immediately. Sanitation across the neighborhood matters, since the fly uses many wild and garden hosts.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Prompt harvest

Pick ripe cherries every two or three days through the ripening stretch, and get the picked fruit into the refrigerator soon after, since cold stops the tiny white maggots that may already be inside.A two to three day harvest interval denies the fly the ripe fruit it needs, and prompt refrigeration arrests larvae in fruit already picked. Pressure climbs steeply through the window, since a generation can turn over in about a week.
Garden sanitation

Clear the culls. Overripe cherries left hanging and any that have dropped are where this fly breeds, so pull them off and get rid of them rather than letting them ferment. It feeds on many other plants too, so keeping other ripe fruit in the yard picked up helps.Removing overripe and dropped fruit strips out the breeding substrate. Because the fly uses a wide range of wild and garden hosts, sanitation across the whole yard carries more weight here than it does for a pest confined to one crop.
Swd monitoring traps

Set a trap baited with apple cider vinegar near the tree. Catching the first flies tells you they have arrived so you can tighten picking and get netting on. It is a warning tool rather than a control.Vinegar-baited traps track adult activity so harvest intervals and exclusion are timed to arrival instead of guessed. Detection, not suppression.
Swd exclusion netting

Very fine mesh over the tree physically keeps the flies off the fruit. It has to be fine enough to stop an insect much smaller than a house fly, sealed at the edges, and it needs to go on before the cherries start to color rather than after.Fine mesh sealed at every edge excludes adults from the canopy. Installed after fruit has begun to color it risks enclosing flies with the crop, so it goes up ahead of ripening, which pairs it with the trap catch above.

No spray for this one. Prevention is the control.

Birds

P · 03

Symptoms Ripe cherries pecked, half-eaten, or gone, sometimes the whole crop in a day or two, with just pits and torn skins left behind. Robins, starlings, waxwings, and jays are the usual culprits and will clean off an unprotected tree.Ripe and ripening cherries pecked, partly eaten, or stripped entirely, often within a day or two of color, with pits and torn skins left on the spurs. Robins, starlings, waxwings, and jays can take the whole crop of an unprotected tree, working the top and outside first. Cause Birds, which zero in on cherries as they ripen. A ripe cherry tree is a magnet, and a flock can clear it faster than any bug. Light-colored kinds like Rainier and small open trees get hit the worst.Fruit-eating birds, which key in on cherries as they color. A ripe cherry tree is one of the most attractive food sources in the yard, and a flock can strip it faster than any insect pest. Yellow cultivars like Rainier and small trees in open settings are hit hardest. Organic treatment Netting is really the only thing that works: cover the whole tree with fine bird netting as the cherries start to color, and tuck it in at the bottom so birds cannot sneak under. This is the main reason to keep a cherry tree small (on a dwarfing rootstock) so you can actually cover it. Shiny tape and scare balloons help for a little while but birds get used to them.Netting is the only reliable backyard control: drape fine bird netting over the whole canopy as the fruit begins to color, securing it at the bottom so birds cannot get under. This is the single biggest reason to keep a cherry small (a dwarfing rootstock) so it can actually be netted. Scare devices (reflective tape, flash tape, balloons) help briefly but birds soon ignore them. Prevention Plan to net the tree from the start: pick a dwarfing rootstock so the grown tree is small enough to cover, and put the net on as soon as the cherries start coloring, not after the birds show up. Nothing else reliably keeps them off.Plan for netting before you plant by choosing a size-controlling rootstock so the mature tree can be covered. Net early, at first color, not after birds have found the tree, and secure the skirt. There is no substitute for physically excluding them.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Bird scare deterrents

Reflective tape, flash tape, and scare balloons can push birds off for a little while and cost little to try. Birds work out that nothing bad happens, so treat these as a stopgap rather than the thing that saves your crop.Visual deterrents buy a brief reprieve before habituation sets in. Worth hanging alongside exclusion, not in place of it.
Bird netting

This is the step that holds: drape fine bird netting over the whole tree as the cherries begin to color, before the birds find them, and tuck the skirt in at the bottom so nothing slips underneath. It is also the reason to buy a tree on a dwarfing rootstock, since a small tree is one you can actually cover.Full-canopy netting applied at first color with the skirt secured is the reliable backyard control. Plan for it before planting by choosing a size-controlling rootstock, because a tree too large to net has no fallback. Robins, starlings, waxwings, and jays can take an unprotected crop within a day or two of color, and light-fleshed cultivars draw the heaviest pressure.

No spray for this one. Prevention is the control.

Black cherry aphid

P · 04

Symptoms Clusters of shiny black aphids (tiny soft insects) on the tips of new spring growth, curling and twisting the young leaves, with a sticky coating below that turns black and moldy. It is worst on young trees and mainly stunts new growth rather than ruining fruit.Dense colonies of shiny black aphids on the tips of new spring shoots, tightly curling and twisting the young leaves, with sticky honeydew below that blackens into sooty mold. Heaviest on vigorous young trees; it slows shoot growth but rarely harms fruit directly. Cause A small black insect called the black cherry aphid. Its eggs overwinter on the tree and the young hatch out to feed on the soft new spring growth. The numbers usually drop on their own by midsummer as the shoots toughen and ladybugs and other helpers move in.The black cherry aphid (Myzus cerasi). It overwinters as eggs on the tree and explodes on the tender spring flush, feeding on sap; populations crash by midsummer as the shoots harden and natural enemies build up. Organic treatment Often you can leave it alone, since ladybugs and other helpers clear it by midsummer. On a young tree that is badly hit, blast the colonies off with a hose, or spray the curled tips with insecticidal soap or horticultural oil. Do not over-fertilize, since lush new growth is what the aphids love.Often no action is needed, since beneficials clean it up by midsummer. For a heavy infestation on a young tree, a strong jet of water knocks colonies off, or insecticidal soap or horticultural oil applied to the curled tips works; protect the ladybugs and lacewings that do most of the control. Avoid high-nitrogen feeding, which fuels the soft growth aphids prefer. Prevention Avoid heavy feeding that pushes the soft growth aphids love, welcome ladybugs and lacewings, and do not panic over the spring leaf-curl, which usually does not hurt the cherries. A dormant oil spray in late winter cuts down the overwintering eggs.Keep trees vigorous but not over-fed (high nitrogen invites aphids), encourage beneficial insects, and tolerate the early-season curl, which rarely affects the crop. A dormant oil spray reduces overwintering eggs where the pest is chronic.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Balance nitrogen

Go easy on fertilizer. Heavy nitrogen pushes out the soft, sappy shoots these aphids multiply on, so a tree fed with restraint gives them less to build on.High-nitrogen feeding drives the tender spring flush the colonies exploit. Keep a young tree vigorous without pushing succulent growth, which removes the resource the population needs most.
Water spray

On a young tree that is badly hit, knock the colonies off the shoot tips with a strong jet from the hose. Often you will not need even this, since the numbers usually fall away on their own by midsummer.A forceful water jet dislodges colonies from the curled tips without setting back the natural enemies working on them. Worth doing mainly where shoot extension on a young tree is being checked, and early in the day so foliage dries.
Beneficial predators

Often the best move is to leave it be. Ladybugs, lacewings, and other helpful insects usually clear the colonies by midsummer as the new shoots toughen, and the spring leaf curl rarely costs you cherries. Avoid broad sprays that would take out those helpers along with the aphids.Natural enemies do most of the work here, and populations typically crash by midsummer as the shoots harden. The injury is a check on shoot growth rather than on fruit, so conserving predators is usually the whole of the treatment.
Insecticidal soap

If a young tree is being stunted and the softer steps have not held, insecticidal soap sprayed into the curled shoot tips kills on contact. Coverage decides the result, since it only acts on what it wets, and it will hit soft-bodied helpers it lands on too. Skip it on a thirsty tree or above 90°F, which risks burning leaves.Soap is contact-only, so it demands thorough coverage inside the curled tips where the colonies sit. It kills the soft-bodied beneficials it directly wets, which argues for spot treatment of affected shoots. Avoid on water-stressed trees and above 90°F.
Horticultural oil

Horticultural oil does the same job on the curled tips, and a dormant application in late winter knocks back the eggs overwintering on the bark where this aphid returns year after year. Keep it off a drought-stressed tree and off anything in bloom, and do not spray in heat above 90°F.Oil smothers colonies on contact in season, and a dormant application reduces the overwintering egg load where the pest is chronic. Observe the bloom precaution, hold off on water-stressed trees and above 90°F, and do not pair it with sulfur inside 30 days while the tree is in leaf; check the oil label, since some specify longer.

No spray for this one. Prevention is the control.

Borers (peachtree and American plum borer)

P · 05

Symptoms Sticky gum mixed with what looks like wet sawdust (frass) at the bottom of the trunk or on the lower branches, usually on a wound or crack. The grubs tunnel under the bark, and a young tree with several can be girdled and weakened. The wounds also let in disease.Gummy ooze mixed with sawdust-like frass at the base of the trunk or on the lower scaffolds, centered on wounds, the graft, or bark cracks. Larvae tunnel in the inner bark; repeated attacks weaken or girdle a young tree, and the wounds also open the door to bacterial canker. Cause Several borers (the grubs of certain moths and beetles), mainly the peachtree borer near the soil line and the American plum borer on wounded bark. They tunnel under the bark of stressed or injured cherry trees, getting in through sunburned bark, canker, and mower wounds.Clearwing moth and beetle borers, chiefly the peachtree borer (Synanthedon exitiosa) at the crown and the American plum borer on wounded bark, whose larvae tunnel the inner bark of stressed or injured stone-fruit trees. Sunscald, canker, and mechanical wounds are the entry points. Organic treatment No spray reaches the grubs once they are inside. Where you can find the holes marked by gum and frass, dig the grubs out with a stiff wire. The better fix is to stop giving them wounds: keep mowers and string trimmers away from the trunk, paint the lower trunk white to prevent sunburn, make clean pruning cuts, and keep the tree healthy.There is no spray once larvae are tunneling inside. Where you can find the entry holes by the gum and frass, kill the larvae with a thin wire (worming). The durable control is to prevent the wounds they need: keep mowers and trimmers off the trunk, paint the lower trunk white to prevent sunscald, prune cleanly, and keep the tree vigorous. Prevention Keep the trunk free of wounds: white trunk paint stops the sunburn cracks borers enter, keep mowers away, make clean cuts, and keep the tree healthy. Check the base of the trunk each late summer for fresh gum so you catch them early.Protect the trunk from injury and sunscald (a white trunk paint helps), prune cleanly to avoid leaving stubs and torn bark, and keep the tree vigorous and free of bacterial canker, since borers and canker feed on the same wounds. Inspect the trunk base each late summer for fresh gum.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Borer stem surgery

Where gum mixed with frass, the wet sawdust-looking droppings, marks an entry hole low on the trunk or a lower branch, push a stiff wire into the tunnel to kill the grub inside. Once a grub is under the bark no spray reaches it, so this is the direct option. The more durable answer is to stop giving them wounds to enter: keep mowers and string trimmers clear of the trunk, whitewash the lower trunk so the bark does not sunburn and split, make clean pruning cuts, and check the trunk base each late summer for fresh gum.Probing the galleries with a wire, guided by the gum and frass at the entry, is the only way to reach larvae already in the inner bark. Treat it as a supplement to wound prevention, which is where the durable control sits: sunscald, canker, and mechanical injury are the entry points, and those same wounds feed bacterial canker.

No spray for this one. Prevention is the control.

Diseases

Brown rot

D · 01

Symptoms At bloom, flowers go limp and brown and small gummy dead patches form on the nearby spurs. As cherries ripen, brown spots appear and spread quickly, sometimes rotting a whole fruit in a day or two in warm, wet weather, with a dusty tan fuzz on top. Rotted fruit shrivels into a hard mummy that hangs on. Split cherries rot the fastest.At bloom, infected blossoms wilt and brown and the infection runs into the spur to form a small gummy canker. As fruit ripens, firm brown spots appear and spread fast, rotting a whole cherry within a day or two in warm, wet weather, with a dusty tan spore mass on the surface. Rotted fruit dries into a clinging mummy. Cracked fruit is especially vulnerable. Cause A fungus called Monilinia. It survives winter in dried mummy fruit and dead twig patches, then releases spores at bloom that infect the flowers, which later cause the fruit to rot. Warm, wet weather makes it spread fast, and a split or wounded cherry rots first.The fungus Monilinia (M. fructicola and M. laxa). It overwinters in mummies and twig cankers; spores at bloom infect flowers, and those infections later seed the fruit rot. Warm, humid, wet weather drives it, and any wound, especially a rain crack, is an open door. Organic treatment Cleanup is the main control: take off and destroy every dried mummy from the tree and ground and prune out the gummy dead twig patches, which hold the spores. If bloom is wet, an organic-approved spray at bloom helps protect the flowers. Pick on time, handle gently, throw out any rotting cherry right away, and grow crack-resistant kinds so fewer split.Sanitation is the core control: remove and destroy every mummy from the tree and ground and prune out gummy twig cankers, since these are the spore sources. In a wet bloom, an organic-approved bloom-time fungicide reduces blossom blight. Pick promptly, handle gently, remove any rotting fruit at once, and choose crack-resistant cultivars to cut the wounds that let it in. Prevention Cleaning up all year prevents most of it: never leave dried mummies over winter, prune so the tree is open and the fruit dries fast after rain, pick on time, and prevent cracking (keep watering even, pick crack-resistant kinds), since split cherries rot first.Year-round sanitation prevents most loss: never leave mummies over winter, keep the canopy open with pruning so fruit dries fast after rain, harvest promptly, and prevent the fruit cracks that invite infection by keeping moisture even and choosing tolerant cultivars.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Garden sanitation

Take off and destroy every mummy, the shriveled rotted cherry that clings on through winter, from both the tree and the ground, and pull any rotting fruit the moment you spot it in season. Those mummies hold the spores that start next year, so clearing them is the core of the job.Mummified fruit on the spurs and on the ground is the primary overwintering reservoir. Stripping and destroying it, plus same-day removal of rotting fruit in season, cuts the spore supply that drives both the blossom phase and the fruit rot that follows from it.
Airflow spacing

Prune so the tree is open and air moves through it. This rot runs fast in warm, wet weather, so fruit that dries quickly after rain has far less chance of picking it up.An open canopy shortens the wetness periods the fungus needs. In warm, humid conditions a lesion can take a whole cherry inside a day or two, so drying time is the variable worth engineering for.
Prompt harvest

Pick on time and handle the fruit gently. Bruises and splits are open doors for the rot, and a cherry left hanging past ripe is the one that goes down first.Timely picking and careful handling reduce the wounds Monilinia enters through. Overripe fruit left on the tree and any rain crack are the highest-risk sites in the canopy.
Resistant varieties

If you are still choosing a tree, pick a crack-resistant kind. A cherry that has split after rain is the one that rots soonest, and watering evenly, without swinging between soaked and dry, works on the same problem.Cultivar crack tolerance lowers the wound load the pathogen exploits, since rain cracks are its most dependable entry. Even soil moisture acts on the same variable and belongs beside the cultivar choice.
Prune out infection

Cut out the gummy dead twig patches, called cankers, where the fungus overwinters alongside the mummies. Take the cut back into clean wood past the dead area and destroy what comes off.Twig cankers carry the fungus through winter with the mummies and seed the blossom infections. Cut well past the visible margin into sound wood and destroy the prunings rather than leaving them near the tree.

No spray for this one. Prevention is the control.

Bacterial canker

D · 02

Symptoms Sunken, dark, gummy patches (cankers) on the trunk and branches that ooze amber sap, often killing the branch above them. In spring, flowers and buds may blacken and die, and some buds never open. It is the most serious sweet cherry disease and can kill a young tree.Sunken, dark, gummy cankers on trunk, scaffolds, and spurs that ooze amber gum, often girdling and killing limbs; in spring, blossoms and spurs blast (blacken and die) and dormant buds fail to open. It is the single most serious disease of sweet cherry and can kill a young tree outright. Cause A bacterium (a microscopic organism) called Pseudomonas syringae. It gets in through wounds, leaf scars, and frost damage during cool, wet weather, and is worse on stressed trees, those in wet soil, hit by frost, or pushed with too much nitrogen.The bacterium Pseudomonas syringae. It infects through wounds, leaf scars, and frost-injured tissue in cool, wet spring and fall weather, and is worsened by anything that stresses the tree: poor drainage, ring nematodes, frost, and high-nitrogen soft growth. Organic treatment There is no cure once it sets in. The approach is prevention: cut out the cankered wood well below the dead patch during dry summer weather (not in wet spring), clean your tools between cuts, and pull out a badly infected young tree. Keep the tree healthy and unstressed; copper sprays only help a little.There is no cure once a tree is infected. Management is preventive: cut out cankered wood well below the canker in dry summer weather (not in wet spring), disinfecting tools between cuts, and remove badly infected young trees. Keep the tree unstressed; copper sprays give only partial protection and resistance is common. Prevention Prevention is everything: plant where the soil drains well, avoid frosty low spots and trunk wounds, paint the trunk white to prevent sunburn cracks, prune only in dry summer weather, and do not over-feed. A healthy, unstressed tree on good ground shrugs it off best.Prevention is everything: plant on well-drained ground, choose a tolerant rootstock, avoid frost-pocket sites and trunk wounds, paint the trunk white against sunscald cracks, prune only in dry summer weather, and never push soft growth with late nitrogen. A vigorous, unstressed, well-drained tree resists it best.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Improve drainage

Start with the site. Soggy, poorly drained soil is one of the stresses that makes this disease worse, so give the tree ground that drains, and keep it out of low frost pockets while you are choosing.Poor drainage is a named predisposing stress, and frost injury is one of the routes the bacterium enters by, so a well-drained site out of a frost pocket removes two of the conditions that tip an infection into a dead limb.
Resistant rootstock

When you buy, ask for a rootstock with some tolerance to this disease. You keep the cherry variety you want and change what it is grafted onto.Rootstock choice is one of the few levers available before planting against a disease with no cure, changing the tree's tolerance without giving up the scion cultivar.
Wet foliage discipline

Prune in dry summer weather rather than in the cool, wet spring. The bacterium enters through fresh cuts, leaf scars, and frost-damaged tissue when conditions are cool and wet, so when you cut matters as much as how you cut.Infection tracks cool, wet spring and fall weather through wounds and leaf scars, so confine cutting to dry summer conditions. This lowers the rate of new infection rather than clearing one already established.
Garden sanitation

Destroy the wood you cut out instead of leaving it near the tree, and take out a young tree that is badly infected rather than nursing it, since there is no cure once it sets in. Hold back on late-season nitrogen too, since the soft growth it pushes is what gets hit.Removal is the endpoint for a badly infected young tree, since no curative treatment exists. Destroying cankered wood and pulling lost trees limits what the planting carries, and late nitrogen that forces soft growth works against every other step here.
Prune out infection

Cut cankered wood out well below the sunken gummy patch, back into healthy wood, and do it during dry summer weather. Disinfect your pruners between cuts so you are not carrying it from limb to limb.Take the cut well below the canker margin into clean wood in dry summer conditions, disinfecting between cuts. How far back you place the cut is what decides whether the excision holds.
Copper fungicide

Copper sprays give partial protection at best and the bacterium is often resistant to them, so treat copper as a small addition to the steps above rather than a fix. It is toxic to fish, it builds up in the soil over the years, and the hazard depends on which copper compound is on the label, so read the active ingredient and use it sparingly.Copper offers partial protection only, and resistance in Pseudomonas syringae populations is common, so it does not stand in for siting, pruning timing, and excision. It accumulates at the soil surface, rates highly toxic to aquatic life, and its acute band varies by compound, from copper octanoate at Low up to copper hydroxide in the DANGER band.

No spray for this one. Prevention is the control.

Cherry leaf spot

D · 03

Symptoms Small purple-brown spots on the leaves in late spring, with the spots sometimes dropping out to leave little holes. Infected leaves turn yellow and fall, and a bad case can strip the tree of leaves by midsummer, which weakens it and the next crop.Small purple-to-brown spots on the upper leaf surface in late spring; the spotted tissue may drop out leaving a shot-hole look, and infected leaves yellow and fall. Heavy infection defoliates the tree by midsummer, weakening it, reducing the crop, and leaving it prone to winter injury. Cause A fungus called Blumeriella jaapii. It spends winter in fallen leaves and infects the new leaves during warm, wet spring weather, building up over a wet season until the tree drops its leaves early.The fungus Blumeriella jaapii. It overwinters in fallen leaves and infects new leaves in warm, wet spring and early-summer weather; repeated cycles through a wet season drive the defoliation. Organic treatment Rake up and destroy the fallen leaves in fall, which is the most useful thing you can do, since the fungus overwinters in them. Keep the tree open so leaves dry fast, and in wet areas an organic-approved spray starting after the petals fall protects the new leaves.Rake and destroy fallen leaves in autumn to remove the overwintering source, the single most useful home step. Keep the canopy open for fast drying, and in wet regions an organic-approved fungicide program from petal fall protects the new leaves. Keeping the tree from defoliating preserves its winter hardiness. Prevention The main thing is raking up and destroying fallen leaves in fall, where the fungus waits out winter. Pruning for good airflow so leaves dry quickly helps too, and a spray program is most important in wet springs.Autumn leaf cleanup is the backbone, since the fungus overwinters in fallen leaves. Good airflow from pruning and prompt drying after rain reduce infection, and a protective spray program matters most in wet springs.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Garden sanitation

Rake the fallen leaves up in autumn and destroy them. The fungus waits out winter in them, and clearing them is the most useful single thing you can do at home.Blumeriella jaapii overwinters in leaf litter, so autumn removal and destruction of fallen leaves cuts the spring spore supply. The highest-value home step against this one by a distance.
Airflow spacing

Prune the tree open so the leaves dry fast after rain, since warm wet spells are what let the spots take hold. A tree that keeps its leaves through the season holds the winter hardiness that early leaf drop costs it.Opening the canopy shortens leaf wetness and slows the repeating infection cycles that can strip a tree by midsummer. Holding the foliage is what protects the following winter's hardiness and the next crop.

No spray for this one. Prevention is the control.

X-disease (cherry buckskin)

D · 04

Symptoms A slow decline over a few years: the cherries on affected branches stay small, pale, and bitter with a leathery skin, and one branch at a time weakens and dies while the rest of the tree still looks okay. There is no cure, and it spreads to nearby trees.A slow decline over a few years: fruit on affected limbs stays small, pale, and bitter with a leathery buckskin look and short stems, leaves may bronze, and individual scaffolds decline and die while the rest of the tree looks normal. It is incurable and spreads to nearby trees. Cause A tiny bacterium-like organism spread by small insects called leafhoppers and through connected roots. It also hides in other infected stone-fruit trees and some weeds. Once a tree has it, it cannot be cured, only removed so it does not spread.A phytoplasma (a bacterium-like organism) spread by leafhoppers and through root grafts. It also lives in nearby infected stone fruit and certain weeds, and once a tree is infected it cannot be cured, only removed to protect others. Organic treatment There is no cure. The fix is to remove it: have a suspect tree tested, then promptly take out and destroy any confirmed-infected tree, roots and all, so it does not spread to your other trees. Clearing nearby weeds and wild cherries helps too.There is no treatment. The control is removal: test a suspect tree, and promptly remove and destroy confirmed-infected trees (including the roots) to stop spread to neighbors. Manage leafhoppers and clear nearby weed and wild-cherry reservoirs. Prevention Prevention means starting with healthy nursery trees, promptly removing infected trees nearby, controlling the leafhoppers that carry it, and clearing weeds and wild cherries that host it. Do not plant a new cherry right next to one you lost to this disease.Prevention rests on clean planting stock, prompt removal of infected trees in the area, leafhopper management, and clearing the weed and wild-Prunus hosts that harbor it. Do not replant a new cherry next to a tree lost to X-disease without removing the source.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Certified clean stock

Start with healthy nursery trees. There is no cure for this one, so what you plant, and what is already growing near you, decides most of the outcome. If a cherry nearby was lost to it, deal with that tree before you put a new one in beside it.Clean planting stock sits at the front of the program for an incurable pathogen spread by leafhoppers and root grafts. Replanting next to an unremoved source simply repeats the exposure, so resolve the reservoir before setting a replacement.
Garden sanitation

Have a suspect tree tested, and if it comes back positive, take it out promptly and destroy it, roots included, so it stops feeding the problem to your other trees. Infected trees on neighboring ground are worth having removed too, since the decline moves outward.Confirmed-infected trees are removed rather than treated, roots and all, because connected roots carry it to neighbors. Test before pulling, since the buckskin symptoms declare themselves limb by limb over several years while the rest of the canopy still looks sound.

No spray for this one. Prevention is the control.

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Cherry (Sweet)

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