Orchard
Pest and disease management
Keeping scab, canker, rots and the main insect pests to a level the orchard can carry, at a cosmetic standard well below dessert fruit but without allowing rot into the crop.
- Stage
- Orchard
- Traditional in
- No single tradition — used wherever it suits
- What it most changes
- Not recorded as moving a sensory dimension
- Safety
- Carries a safety consideration — see below
Rotten fruit is the one disease problem that cannot be treated as cosmetic. Penicillium expansum growing in bruised or rotting apples produces patulin, a mycotoxin regulated in apple juice and apple products in most jurisdictions; rejecting rotten fruit at sorting is the only reliable control, since it cannot be removed later by pressing or filtration. Where plant protection products are used, follow the approved conditions and pre-harvest intervals that apply in your jurisdiction, and take particular care in orchards where fruit is gathered from the ground.
What it is
Cider orchards carry the same pathogens and pests as dessert orchards, but they are managed to a different specification. Apple scab, canker, blossom wilt and the fruit rots are the main diseases; codling moth, sawfly, winter moth, woolly aphid and rosy apple aphid the main insect problems. The work consists of monitoring for infection periods and pest flight, cultural measures that reduce inoculum and habitat, cultivar and rootstock choice, encouragement of natural enemies, and targeted intervention where those are not enough. What distinguishes cider is that surface blemish does not matter and rot very much does.
Why it is used
- Severe scab defoliates trees and weakens them over successive seasons, reducing the following year’s cropping even where the fruit itself is destined for milling.
- Canker kills fruiting wood and eventually whole limbs, and on susceptible cultivars in a wet climate it can make an orchard uneconomic within its first decade.
- Rotten fruit carries mould into the mill and press, and Penicillium expansum in particular produces patulin, which is a food safety matter rather than a quality preference.
- Root and collar rot on wet sites kills established trees outright and cannot be treated once it has taken hold, so it has to be prevented by site and drainage decisions.
How it works
- Venturia inaequalis overwinters in fallen leaf litter and releases ascospores in spring; infection requires a period of leaf wetness whose necessary length falls as temperature rises, which is why scab management is driven by wetness and temperature records rather than by the calendar.
- Neonectria ditissima enters through wounds — pruning cuts, leaf scars, picking damage, frost cracks — and is favoured by wet autumn conditions, so wound timing, wound size and drainage are the principal cultural controls.
- Monilinia fructigena enters fruit through skin damage caused by scab cracks, insect feeding or handling, then spreads by contact between touching fruit and overwinters in mummified fruit left in the tree.
- Phytophthora species need free water to move to the collar and root, so their distribution within an orchard maps onto the wettest ground rather than onto anything about the tree.
- Fungal spores and insect eggs both overwinter somewhere specific — leaf litter, mummies, cankered wood, bark crevices — so removing or breaking down those reservoirs lowers the following season’s starting inoculum.
The chemistry and the organisms
What is actually being changed, and by what. Each entry says what that compound or organism does in cider generally; this page is one place it does it.
Compounds involved
Organisms involved
Venturia inaequalis
The cause of apple scab, the most widespread apple disease in temperate regions, and one whose consequences for cider fruit are far smaller than for dessert fruit.
Neonectria ditissima
The fungus that causes European apple canker, a tree disease that kills branches and whole young trees and shortens the productive life of an orchard.
Monilinia fructigena
The brown rot of apples and pears, recognisable by concentric rings of buff pustules, and a major cause of fruit loss between the orchard and the mill.
Phytophthora species
Water moulds of wet soils that cause collar and crown rot in apple trees and rot fruit lying on wet ground, and the reason orchard drainage is a disease measure.
Penicillium expansum
The blue mould of stored apples and the principal producer of patulin, the one genuine chemical safety issue that rotten cider fruit raises.
Botrytis cinerea
Grey mould: a broad-host-range fruit rot whose laccase enzyme oxidises phenolics and whose glucans make a juice difficult to clarify.
What can go wrong
Faults that begin at this step, or that this step makes more likely. Each one is set out with its causes and whether it can be put right.
Patulin contamination
Contamination of juice or cider with patulin, a mycotoxin produced by Penicillium expansum in rotting apples — a genuine food-safety question rather than a flavour one.
Mould taint
Musty, earthy, cellar-damp or rotten-fruit character carried in from mouldy fruit or from mouldy equipment, and a marker that the patulin question needs asking.
More on pest and disease management
The lower cosmetic standard of cider fruit is genuine and it changes the economics of the whole programme. Scab lesions on the skin, russet, a scarred cheek or a lopsided fruit are irrelevant to something that will be milled and pressed, so cider orchards are commonly managed with a fraction of the fungicide input that a dessert orchard supporting a supermarket specification requires, and many traditional orchards receive effectively none. That is a defensible position for skin blemish. It is not a defensible position for rot, and the two are often conflated. A scabbed apple presses into perfectly sound juice; a rotten one brings Penicillium expansum and its patulin into the batch, and no amount of downstream processing takes it back out. This is why sorting at intake, and windfall discipline, do more for cider safety than any orchard spray programme.
Regional pressures differ enough that no single programme travels. Scab pressure is severe wherever spring and summer are wet and humid, which describes the English west, Brittany and Normandy, Ireland and above all the Cantabrian coast of Spain, where Asturian and Basque orchards contend with high rainfall through the growing season. Canker is likewise a wet-climate disease and is a leading cause of tree loss in western Britain and Ireland on susceptible cultivars. In much of eastern North America the defining disease is fire blight, largely absent from British and French cider country, which is a substantial part of why rootstock breeding at Cornell has taken the direction it has. Warmer, drier interior regions such as parts of the North American west face lower fungal pressure and different insect problems.
Practical management is mostly cultural and mostly cheap. Encouraging leaf litter breakdown over winter, whether by grazing, mowing or letting worms do it, cuts the spring scab inoculum. Removing mummified fruit and cankered wood during winter pruning, and pruning in dry weather so wounds dry before spores land on them, addresses canker and brown rot together. Choosing cultivars with known tolerance for the local disease pressure is the strongest single decision and is taken once, at planting. Old traditional orchards with a diverse understorey and surrounding hedges support natural enemies — parasitoids, predatory beetles, earwigs and birds — that suppress aphids and caterpillars without intervention, which is one of the few places where the habitat value of a traditional orchard and its productive interest point in the same direction.
Related processes
Steps that sit alongside this one, replace it, or depend on it having been done.
Harvest
Fruit sorting
Taking rotten, mouldy and damaged fruit and foreign material out of the crop before it reaches the mill, which is the primary control on patulin in cider.
Harvest
Windfall management
Deciding which fruit that has reached the orchard floor can be used, and getting the rest out of the crop before it becomes a patulin problem.
Juice treatment
Patulin control
Managing the mycotoxin produced by rot fungi in damaged apples, which is controlled by fruit selection rather than by any treatment applied to juice.
Orchard
Pruning
The recurring cut made on a cropping tree to keep light in the canopy, renew fruiting wood, hold the balance between growth and fruit, and take out disease and deadwood.
Orchard
Soil and drainage
Assessing and correcting soil depth, structure, pH and water movement so that orchard roots get both water and air across a wet winter and a dry summer.
What people ask next
Questions readers ask about the things this page mentions. Each one goes to the section that answers it rather than to a page written to receive the question.
- How do cider makers keep patulin out — By sorting rotten fruit out before milling, because patulin comes from moulds growing on damaged apples. Fermentation reduces what gets through, so fermented cider carries no limit where juice does.
- How should a cider tree be pruned
- Can you use windfall apples for cider — Traditional cider making relies on fruit gathered from the ground, and there is nothing wrong with it if it is sound. Rotten fruit is a different matter: brown rot carries patulin into the juice and should be discarded, not pressed.
- Does cider contain patulin — Patulin comes from mouldy fruit and is regulated in apple juice. Fermentation reduces it substantially, so fermented cider carries far less risk than unfermented juice made from the same fruit.
- Why does mouldy fruit matter for cider — Penicillium expansum is the blue mould of stored apples and the principal producer of patulin. Sorting rotten fruit out before milling is a food-safety step and not only a quality one.
- Do you need to sort apples before pressing
Where to go next
- How cider is made — The whole sequence, stage by stage, with the choices open at each one.
- Cider science — The chemistry and microbiology the methods on this page rest on.
- Troubleshooting — What goes wrong, how to recognise it, and whether it can be reversed.
Sources
What this page rests on. Where a source is marked as registered rather than read, CiderHQ is recording that the body is authoritative on the subject without claiming to have worked through the document itself. See our evidence policy for what each state means.
NIAB (incorporating East Malling Research)
NIAB · research institute · retrieved 2026-08-24
East Malling developed the M-series apple rootstocks that determine tree size in essentially every modern orchard, cider orchards included. The authority CiderHQ uses for rootstock behaviour.
A Somerset Pomona: The Cider Apples of Somerset
Liz Copas, The Dovecote Press, 2001. ISBN 9781874336877 · reference work · bibliographic record verified, not opened 2026-08-25
Bibliographic record verified on 2026-08-25 against Open Library: Liz Copas, The Dovecote Press, 2001, ISBN 9781874336877. The author was Long Ashton’s cider pomologist, which is why this work is registered for Somerset cultivar identity at all — it is the nearest thing to a successor to the station’s own descriptions. No copy was opened. Not digitised in any open collection.
Teagasc — Agriculture and Food Development Authority
Teagasc · research institute · retrieved 2026-08-24
European Food Safety Authority scientific opinions
EFSA · regulator · retrieved 2026-08-24
Registered for the food-safety questions cider genuinely raises: patulin in juice from rotten fruit, sulphite sensitivity, and the toxicology behind additive limits.