Divisi
Sesame gall midge
Asphondylia sesami · Insect
Photo: Joydeep · CC BY-SA 3.0
Sesame gall midge (Asphondylia sesami) is a tiny fly whose orange maggots grow sealed inside sesame flower buds and young capsules, forcing the tissue to swell into a hard, deformed gall (a swollen lump). It attacks only sesame, and only during flowering and capsule-fill in warm, humid weather — the exact moment the crop should be setting seed. Galled buds never open and galled capsules set little or no seed, so an attack can quietly erase a large share of the harvest before the crop is ever cut.
Vengolis · CC BY-SA 4.0
Why it matters
Sesame gall midge attacks the very part of the plant that makes your money — the flower buds and young capsules that should fill with seed. A bad attack can swell and kill up to half your capsules — about 50% of your harvest — and every galled bud or capsule is gone for good: it will never set seed, no matter what you do afterwards. It is hard to stop once it starts, because the maggot sits sealed inside the gall where ordinary sprays cannot reach it — so your only real defence is catching it early, at the very first galls, and stopping it from carrying over into next season.
When to act
galled, deformed flower buds or capsules appearing during flowering and capsule set
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 sesame gall midge field guide
- Identify it
- Scout for it
- Control it
12 field-guide sections in the app
The full guide to sesame gall midge — 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 sesame gall midge?
The damage you see first: where a normal slim bud or long, pointed capsule should be, you find a swollen, hard, rounded knob or lump — this is the gall. Galled flower buds stay shut and never open into a flower; galled capsules are stunted, twisted and empty, or hold only shrivelled seed. Many galled buds simply dry up and drop off the plant without ever setting seed.
When should I take action against sesame gall midge?
galled, deformed flower buds or capsules appearing during flowering and capsule set
How do I control sesame gall midge?
Prevent it first — beat the midge on timing (your strongest tool): plant early and all at once with your neighbours so your crop flowers and sets its capsules before midge numbers build up to their peak. Avoid late or staggered planting — a long, drawn-out flowering window just gives the midge more time and more buds to attack.
Which crops does sesame gall midge affect?
Among the crops covered here: Sesame.
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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