Divisi
False codling moth
Thaumatotibia leucotreta · Insect
Photo: Simon Hinkley & Ken Walker, Museum Victoria · CC BY 3.0 au
False codling moth (Thaumatotibia leucotreta) is a small, drab, night-flying moth whose caterpillar feeds hidden inside the fruit — of citrus (oranges, grapefruit, mandarins), avocado, cashew and sweet or hot peppers. The female glues single eggs onto the fruit skin, and within hours of hatching the tiny caterpillar bores straight in and tunnels through the flesh, so the fruit colours early and drops before its time. The full-grown caterpillar then leaves the fruit to turn into a moth in the soil (this is called pupating), and in warm weather one generation follows another all year with no clear break. It is a quarantine pest — one the authorities restrict — so infested fruit must never be moved or sold to a new area.
Simon Hinkley & Ken Walker, Museum Victoria · CC BY 3.0 au 
Ben Sale from UK · CC BY 2.0
Why it matters
False codling moth attacks the one thing you actually sell — the fruit — and a bad infestation can cost you up to a third (30%) of your harvest. The trouble is that the caterpillar bores inside the fruit within hours of hatching, so by the time you see fruit colouring early and dropping, the damage is already done and no spray can reach the pest hidden inside. It breeds all year round in warm weather and drifts easily from farm to farm, so once it builds up in your orchard it is very hard to shake off. Your real defence is to stop it early and keep the ground under your trees clean.
When to act
any dropped fruit with entry holes, or moths caught in pheromone traps above the local trap threshold
This guidance is general, compiled from published agronomic references including FAO and CABI. Thresholds and timing shift with your crop, your variety and the season.
In much of the region a spray is simply called mushonga — medicine. But a chemical group you cannot name is one you cannot rotate, and a product you did not write down has no pre-harvest interval you can observe. Mushonga, and other farming words →
The full false codling moth field guide
- Identify it
- Scout for it
- Control it
14 field-guide sections in the app
The full guide to false codling moth — every symptom to check, how and when to walk your field looking for it, and the controls that actually work, ranked. Built into your crop plan, so you are told to look before it costs you a harvest.
Crops it affects
Frequently asked questions
How do I identify false codling moth?
The damage you notice first: a few fruit that colour up or ripen too early while the fruit around them is still green — and then drop to the ground before they should. Look closely at the skin for a tiny entry hole, like a pin-prick, often ringed with crumbly brown, sawdust-like droppings (this waste is called frass) and sometimes a small bead of dried gum.
When should I take action against false codling moth?
any dropped fruit with entry holes, or moths caught in pheromone traps above the local trap threshold
How do I control false codling moth?
Prevent it first — keep the orchard floor clean (your cheapest, strongest tool). At least once a week, pick up EVERY fallen fruit and strip any hanging fruit that has a hole, then bury them deep (half a metre or more) or seal them in a closed drum or bag so the caterpillars inside die. Do not just heap them at the field edge — the caterpillars crawl out to turn into moths in the soil and come straight back. And don't leave over-ripe fruit hanging on the tree for them to feed on.
Which crops does false codling moth affect?
Among the crops covered here: Avocado, Cashew, Grapefruit, Hot pepper, Mandarin / tangerine, Sweet orange, Sweet pepper.
Catch it before it costs you a harvest
Divisi builds scouting into your crop plan — it tells you when to walk your field, what to look for at that stage, and what to do when you find it. Free for farmers, works offline.
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