Divisi
Sorghum shoot fly
Atherigona soccata · Insect
Photo: Digvijaysinh Padhiyar · CC BY-SA 4.0
Sorghum shoot fly (Atherigona soccata) is a small ash-grey fly, a little smaller than a housefly, whose maggot is the enemy of young sorghum and pearl-millet. In the first three weeks after the crop emerges, the maggot bores into the base of a seedling and cuts the central growing shoot, so the youngest leaf wilts and dies — the classic 'dead-heart'. The danger is confined to the seedling stage: late-sown, slow-growing crops sit in the firing line longest and suffer most, and although a struck plant may sprout side-tillers, it never recovers a full head.
Why it matters
Sorghum shoot fly strikes at your crop's most helpless moment — the first three weeks after the seedlings come up — and can take up to half your harvest before the plants are knee-high. Its maggot cuts the central growing shoot and kills the main stem: the plant may throw out weak side-shoots but never carries a full grain head, so the stand ends up thin and patchy. Once a seedling shows a dead-heart the harm is already done — you cannot un-cut the shoot — and on a late-sown, slow crop the fly can work through the whole field in those few early weeks. The whole fight is won or lost early: you protect the seedlings in the first three weeks, or not at all.
When to act
More than about 10 percent of seedlings showing dead-hearts within the first three weeks after emergence.
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 sorghum shoot fly field guide
- Identify it
- Scout for it
- Control it
13 field-guide sections in the app
The full guide to sorghum shoot fly — 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 sorghum shoot fly?
The damage (a 'dead-heart'): in the first few weeks after your sorghum comes up, the central youngest leaf — the spike in the middle of the whorl — wilts, dries and turns straw-brown while the outer leaves are still green. Give it a gentle tug: a dead-heart slides out easily, like pulling a straw from a bundle, and the soft base smells rotten. That dead central shoot is the surest sign.
When should I take action against sorghum shoot fly?
More than about 10 percent of seedlings showing dead-hearts within the first three weeks after emergence.
How do I control sorghum shoot fly?
Prevent — sow early: sow with the very first rains so your seedlings race through the risky 3-week window before fly numbers build up. Late sowing sows straight into trouble. Use a higher seed rate than usual so that even if some seedlings are lost you still keep a full, even stand.
Which crops does sorghum shoot fly affect?
Among the crops covered here: Pearl millet, Sorghum.
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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