Farkesht technical guide
Aphid control in fruit trees: prevention and treatment
You do not beat aphids with a spray, you beat them with a calendar. One female makes twenty generations in a season and gives birth to live young without ever meeting a male — and the spray that kills the colony also kills the ladybird that was doing the job for free.
- Aphid generations in a single warm season
- 20generations
- Nymphs one female produces in her life
- 80nymphs
- Aphids a single ladybird larva eats per day
- 50aphids/day
Updated September 1, 2026Farin Kesht Taban Co.
Chapter one
Why an aphid population explodes overnight
If you read only one part of this page, read this one. Any aphid advice built without this cycle in view arrives late.
- 1
The overwintering egg
Glossy black eggs in bark cracks and around bud bases. The only stage where the whole of next year’s population is in one place — and the most reachable target in the entire cycle.
- 2
The stem mother
Hatches from the egg, wingless, and starts producing young without mating. One insect on one shoot that nobody sees.
live birth, no male
- 3
The wingless generations
All female, all parthenogenetic, all bearing live young. This is the stage a grower calls "the aphids arrived" — and several generations have already passed by then.
live birth, no male
- 4
The winged migrants
When the shoot crowds or the sap thins, the next generation grows wings and leaves. Which is why your neighbour’s clean tree is infested a week later.
live birth, no male
- 5
The autumn sexual forms
In autumn males and sexual females appear, return to the woody host and lay the egg. The loop closes and everything is ready for next spring.
One female, four weeks, nothing eating her
An undisturbed colony doubles every 4 days, and each nymph is reproducing itself within 7 days. This is not a forecast; it is the ceiling that predators, heat and leaf quality all cut into. But the slope is the slope your weekly walk is racing.
- starts at
- 1
- end of week four
- 128
Chapter two
Is it actually an aphid? Six insects that get confused
Three of these six are barely touched by anything sold for aphids, and one of them — the mite — gets worse after a broad-spectrum spray. So identification is the first economic decision on this page.
- This page’s subject
Aphid
The difference: A soft pear-shaped body and two short tubes — cornicles — at the rear. Slow, and it rarely bothers to run.
If you get it wrong: Everything on this page was written for this one insect.
Psyllid
The difference: Wings held roof-like over the back, and it jumps at the slightest touch. No tubes at the rear.
If you get it wrong: Different timing and different rates; an aphid programme usually misses it entirely.
Whitefly
The difference: Small, powdery white wings. Shake the branch and a white cloud rises — something an aphid never does.
If you get it wrong: A different cycle under glass, and an aphid spray will not reach the scales under the leaf.
Thrips
The difference: Very narrow and elongated, like a line. The real field sign is silvering on the leaf surface, not the insect.
If you get it wrong: The damage is on flowers and young fruit, and both the threshold and the timing are separate.
Mealybug
The difference: A white waxy coat with short filaments all around the margin. Almost motionless, and it hides in crevices.
If you get it wrong: The wax repels a contact spray; without an oil or a wetter, nothing happens.
Mite
The difference: Eight legs instead of six, a round body, and fine webbing between leaves. The webbing usually shows before the mite does.
If you get it wrong: The worst mistake available: a broad-spectrum spray kills mite predators and the mite population multiplies afterwards.
Which aphid on which tree?
This is not a quarantine list, it is a "where to look" list. Several of these species will take other hosts under pressure.
| The green peach aphid sits on almost everything and carries the most virus; the rest are narrower, and that narrowness is what makes identification easy. | Apple | Pear | Stone fruit | Citrus | Walnut | Pistachio |
|---|---|---|---|---|---|---|
| Green peach aphid | expected | expected | expected | expected | expected | expected |
| Woolly apple aphid | expected | expected | rare | rare | rare | rare |
| Rosy apple aphid | expected | expected | rare | rare | rare | rare |
| Black aphid | rare | rare | expected | expected | rare | expected |
| Walnut aphid | rare | rare | rare | rare | expected | rare |
| Mealy plum aphid | rare | rare | expected | rare | rare | rare |
If there is no insect on the leaf at all and only the colour pattern has changed, that is another dossier:The nutrient deficiency dossier
Chapter three
Three routes of damage, and only two answer to counting
The first two rise and fall with how many aphids there are, so a threshold and a count govern them. The third has nothing to do with numbers — and that is what pushes this page towards prevention rather than a better spray.
Direct feeding on sap
The colony settles on a growing shoot and draws phloem sap. Extension stops, leaves curl, and in a tree’s establishment year that alone is a season lost.
What you see: Curled and clustered terminal leaves, a shoot that stopped short, and a dense colony under the leaf.
Honeydew and sooty mould
Aphids excrete the surplus sugar as honeydew. It falls onto the leaf below and sooty mould grows on it — a black film that takes the light and cuts photosynthesis. On fruit it costs a grade.
What you see: A sticky shine on leaves and fruit, then black velvety patches, and ants running up and down the trunk.
Virus transmission
Some viruses move in a single probe, before the aphid has even decided whether to stay on this tree. No spray is fast enough to get inside that second.
What you see: Mosaic and distortion on a tree that was clean in previous years — and the sign stays after the aphids have gone.
Scouting and the action threshold
What separates a professional grower from an amateur is not the product they buy; it is that they counted before buying it. The three figures below are a working frame, and if your local extension service has given you a number of its own, that number wins.
- 25 shoots
- Shoots examined per block on each round
- 15 %
- Share of infested shoots at which action pays
- 7 days
- Days between rounds through the spring peak
Where: the growing shoots
Aphids sit on soft tissue, not old leaves. Check terminal shoots and water sprouts, from several scattered points in the block rather than one row.
What: the underside
The colony is under the leaf, not on top of it. Turn it over. While you are there, look for ladybird larvae and bronze mummies too — their presence changes the decision.
When: mornings, weekly
Once a week through the peak, in the cool of the morning when the insects are slow. A monthly walk means three generations went unseen.
Record: write the number down
Log the share of infested shoots with the date. The right decision comes from the trend across two rounds, not from how bad today looked.
A threshold is not a universal constant: it is lower in a bearing orchard with fruit close to harvest, lower again in a nursery or an establishment year, and higher in a block where ladybird larvae are already at work. The figure on this page is a starting point, not a verdict.
Chapter four
What the orchard is already doing for free
Most aphid colonies collapse in June with nobody doing anything. These five are the reason — and a broad-spectrum spray removes all five in an afternoon.
Ladybird larva
predatorLike a small grey alligator with orange spots, and nothing like a ladybird — which is why the most effective predator in the orchard is so often killed as a pest.
50 aphids/dayAdult ladybird
predatorThe one everybody knows. Eats less than its own larva, but it flies, and it lays its eggs right beside the colony.
25 aphids/dayLacewing larva
predatorWith sickle-shaped jaws. The adult eats pollen and nectar, so a flowering strip beside the block feeds the larvae directly.
30 aphids/dayHoverfly larva
predatorLegless, slug-like and pale green; most growers see it as dirt and wipe it off. It crawls through a colony and hollows it out from inside.
40 aphids/dayParasitoid wasp
parasitoidToo small to see, but its work is not: a swollen bronze aphid with one round hole. Every mummy is one aphid finished and one new wasp.
20 aphids/day
50 aphids/day
Ants: they cancel every figure above
Ants eat the honeydew and defend the colony in return. A colony under ant protection is one none of these five predators reaches — and a grower who has not banded the trunk has effectively hired security for the aphids.
ants first, then aphids
They drive off predators
They attack ladybird and lacewing larvae and keep the parasitoid wasp away from the colony.
They move the colony
They carry aphids to fresh shoots and softer leaves, effectively spreading the colony through the block.
They clear the honeydew
By eating the honeydew they suppress sooty mould, and the colony stays healthier and denser.
Chapter five
The treatment ladder: cheapest first, most destructive last
Listed, these eight options let a grower read down to the strongest thing available. Plotted on two axes, it becomes clear which corner the strongest thing sits in — and why that corner is a trap.
- 1
A jet of water
Washes the colony off the shoot. Entirely effective on a few infested trees and in a home garden, and not on a hectare.
Rung one: no productno pre-harvest interval - 2
Cut out the infested tips
Where the infestation sits on a handful of shoots, cutting them out and taking them off the block is the fastest thing available.
Rung one: no productno pre-harvest interval - 3
Band the trunk against ants
A sticky band on the trunk. It kills nothing directly, but it releases the predators to do their work.
Rung one: no productno pre-harvest interval - 4
Insecticidal soap
Breaks down the waxy layer on the aphid’s body. It only acts on what it wets, so complete coverage of the underside is the condition.
Rung two: contact and mildno pre-harvest interval - 5
Summer oil
Smothers by blocking the breathing pores. Not to be used in high heat or on a water-stressed leaf; it scorches.
Rung two: contact and mildno pre-harvest interval - 6
Dormant oil on the eggs
The most effective single job of the year. On a leafless tree, on the overwintering eggs, before a single aphid has been seen.
Rung two: contact and mildno pre-harvest interval - 7
Selective insecticide
Compounds that act on sap-suckers while largely sparing the predators. Read the pre-harvest interval on the label.
Rung three: selective14 days pre-harvest - 8
Broad-spectrum insecticide
Kills everything, including the things that were working for you. The last option, not the first.
Rung four: last resort21 days pre-harvest
Rung one: no product
Nothing enters the orchard. On a small local colony this is often enough, and it costs the predators nothing at all.
Rung two: contact and mild
Soap and oil work by smothering, not by poisoning; complete coverage of the underside is the condition, and they build no resistance.
Rung three: selective
A selective compound acts on sap-suckers and leaves the predators largely intact. It carries a pre-harvest interval.
Rung four: last resort
When the threshold has been crossed and a lower rung has been tried and was not enough. Once a season, and rotate the chemical group.
Eight steps before pulling the trigger
Two of these eight steps exist only to stop a spray happening: counting before deciding, and looking for larvae and mummies before reaching for anything at all.
- 01
Settle the identification first
Find the two tubes at the rear. If they are not there, this page is not your subject and an aphid product is money thrown away.
Aphid confirmed by eye
- 02
Count, do not guess
Work out the share of infested shoots from several points in the block and compare it against the threshold.
One number, dated, on paper
- 03
Look for ladybirds and mummies
If you find ladybird larvae and holed bronze aphids, natural control is running. Waiting a week here is worth more than any spray.
A deliberate decision to wait or to act
- 04
The lowest rung that works
Start at rung one and only climb when the rung below has been tried and was not enough.
The chosen option, with a reason
- 05
The right hour and conditions
Early morning or evening, no wind, and never on open flowers — the bees are on those. Not on a water-stressed leaf either.
Right hour, flowers closed
- 06
Hit the underside
The colony is under the leaf. Spraying from above wets the upper surface and leaves the aphids untouched. Turn the nozzle.
Full coverage of the lower surface
- 07
Rotate the chemical group
With twenty generations a year, aphids build resistance faster than any other pest. Two consecutive applications from one group builds it.
A different group from last time
- 08
Count again
Go back to the same shoots a few days later. Without this step you do not know whether the spray worked or the weather turned.
Before and after, compared
Judge the result 5 days after the treatment, not the following morning. Dead aphids stay on the leaf for a while and the surviving ones are not immediately visible; only the second count tells the truth.
Chapter six
The aphid calendar: the cheapest job is in the month with no aphids
The shape of this chart is the whole argument. The most effective and cheapest intervention of the year sits in the three months when not one aphid can be seen, and the month a grower first notices the problem is the month every option has become expensive.
- Dormant oilLeafless tree, eggs on the bark and within reach. One pass here lowers the pressure of the entire following spring.
- Egg hatchCoincides with bud break. The first weekly rounds start from here.
- Population peakFast shoot extension and soft tissue everywhere. Threshold decisions are made in these three months.
- Natural enemiesLadybird, lacewing and wasp at their most active. A broad-spectrum spray does its worst damage in this window.
- Autumn returnWinged forms return to the woody host and lay. Clearing water sprouts and weeds pays here.
Six jobs that lower next year’s pressure
Not one of these six can be done on the day you see aphids; all of them happen before that day. Which is why an orchard with a plan sprays less, not more.
- winter
One dormant oil pass
On a dormant, leafless tree. It takes the overwintering eggs, there is no predator in the orchard to harm, and there is no pre-harvest interval.
- all year
Keep nitrogen in check
Heavy nitrogen makes soft, watery growth — exactly what an aphid wants. An over-fed orchard is one that invited the colony in.
- spring
A sticky band on the trunk
Fitted before ants become active in spring. The cheapest job on this page, and it works entirely in the predators’ favour.
- spring
A flowering strip beside the block
Adult lacewings and hoverflies eat pollen and nectar. With no flowers, you get no larvae to eat the aphids.
- summer
Remove water stress
A thirsty tree makes more concentrated, more nutritious sap for the aphid, and has no capacity to grow back what it loses. Consistent irrigation is part of pest control.
- autumn
Water sprouts and weeds
Suckers and water sprouts are the softest tissue in the orchard and an overwintering refuge. Broadleaf weeds host several species as an intermediate.
Canopy density, and the flush that follows a cut, are pruning decisions and they are explained in their own dossier:The fruit tree pruning dossier
Chapter seven
Farkesht products and their part in this
Farkesht sells no insecticide, so this chapter does not claim to be the answer to an infestation. What it can honestly claim is the nutritional half of the problem: both the cause a colony is built on, and the rebuilding of a canopy that has been eaten.
Organic fertilisers
Organic fertilisers: balanced nutrition released gradually, instead of the nitrogen hit that makes the soft aphid-friendly growth. The slowest and most durable lever you have on pest pressure.
Biostimulants
Growth stimulants: for a tree whose canopy has been stripped and has to make it back before the season ends. These do not kill aphids; they help the tree out of the damage.
Plainly: neither of these two groups kills aphids, and we do not sell an aphid product. If the population is over the threshold, what you need is not on this list — it is in chapter five. What is here is the work that can be done before and after that day.
Chapter eight
The Farkesht aphid management course
What you have read is the frame of the decision. The course walks the same route with a camera on a real tree: the colony under the leaf, the ladybird larva that looks like a pest, and one complete scouting round start to finish.
Bearing orchards
Where the pre-harvest interval and fruit quality narrow the decision. The course works on thresholds, rung selection and a multi-year plan.
Greenhouses and confined crops
Under cover there is no rain and no natural predator, and the cycle turns several times faster. The course covers released biological control.
Gardens and household trees
Where a jet of water and cutting out a few shoots is usually enough and no product is needed at all. The course shows where that line is.
What the course covers
Every module ends in something you can do, not something you can recite. If you finish a module unable to do the thing written beside it, that module has not done its job.
- 01
Identification: aphid or look-alike
Seeing cornicles on a real insect, separating aphids from psyllid, whitefly and mite, and knowing the common species per host.
Separate an aphid from five look-alikes
- 02
Scouting and counting
One complete round of a block: where, how many shoots, how to record it, and how to build a trend from two rounds.
Run a standard scouting round
- 03
Natural enemies and ants
Recognising ladybird and lacewing larvae and wasp mummies on the leaf, and banding the trunk properly.
Find the predators in your own orchard
- 04
Spraying properly
Choosing the rung, setting the sprayer, covering the underside, the right hour, and respecting the pre-harvest interval close to picking.
Apply one effective and safe treatment
- 05
Resistance and rotation
Why aphids build resistance faster than anything else, how to read the chemical group, and how to write a seasonal rotation.
Write a group-rotation plan
- 06
The year-long plan
From the dormant oil to clearing water sprouts in autumn: building a calendar specific to your own species and region.
Build a calendar for your own orchard
- Sectioned curriculumEach course is divided into sections and lessons, so you can go straight to the part you need.
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Courses available now
This list is read straight from the Farkesht library — every course published appears here.
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Chapter nine
Plans and how to get in
There are two routes to these lessons: buy the single course you need, or take a plan that opens the whole library at once.
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You buy a course and it stays open in your account permanently. Right when you know exactly which subject you need.
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Opens every video course, the technical knowledge base and the species files together — and any course published while the plan runs is included too.
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Questions
Common questions about aphids
The eight asked most often in the forum.
How do I know my tree has aphids?
Turn over the terminal leaves; the colony is under them, not on top. There are three indirect signs too: a sticky shine on leaves and fruit (honeydew), black velvety patches growing on that stickiness (sooty mould), and ants running steadily up and down the trunk. The ants are usually seen before the aphids are.
When should I spray?
When you have counted and crossed the threshold — not when you saw the first aphid. Before deciding, check two things: ladybird larvae and holed bronze aphids. If those are present, natural control is running, and waiting a week usually beats spraying. And never spray on open flowers.
Do home remedies like soapy water work?
Insecticidal soap genuinely works, but only on contact: any aphid you do not wet survives, so full coverage of the underside is the condition and several passes are needed. Ordinary dish detergent is not a substitute and scorches young leaves. For a few household trees, a jet of water is usually simpler and more effective than either.
What do ants have to do with aphids?
It is a trade: the ants eat the aphids’ honeydew and in return defend the colony against ladybirds, lacewings and parasitoid wasps, and even carry aphids to fresh shoots. While the ant route up the trunk is open, the natural enemies effectively have no access to the colony. A sticky band on the trunk is the cheapest measure on this whole page.
Should I buy ladybirds and release them?
Under cover, in a greenhouse, releases work. In an open orchard, bought adult ladybirds usually fly away. The more effective move is to make conditions right for the population that arrives on its own: a flowering strip to feed the adults, a band against the ants, and no broad-spectrum spray in the window when the predators are active.
I sprayed and they were back two weeks later. Why?
Three likely reasons: incomplete coverage, with nothing reaching the underside; winged forms re-entering from the neighbouring block; and above all, the loss of the predators. A broad-spectrum spray kills the aphids and their enemies together, but the aphid has twenty generations a year and the ladybird does not — so the aphid returns first, into a block with no competition left.
Does fertilising cause aphids?
Heavy nitrogen, yes. Excess nitrogen makes fast, soft, watery growth, and the sap of that tissue is exactly what aphids reproduce best on. That does not mean not feeding; it means the right amount at the right time. Balanced, gradually released nutrition keeps pest pressure lower.
Can I manage my orchard’s aphids from this page?
The framework and the numbers are here and it is enough to start. What a page cannot give you is trained eyes: telling a ladybird larva from a pest, finding a mummy on a leaf, and running a standard round on real ground. Those three affect the outcome more than any choice of product, and they are exactly what the video course shows.
This year, a better calendar rather than more product
Start with the video course — or request a consultation if you want an adviser to look at your own block and write the season’s plan.