Divisi
Pod fly
Melanagromyza obtusa · Insect
Photo: Unknown authorUnknown author · Public domain
Pod fly (Melanagromyza obtusa) is a tiny shiny-black fly, barely 2 mm long, whose grub is a hidden seed-eater of pigeon-pea — the only crop it attacks. The female lays into young green pods; the maggot then grows up sealed inside, hollowing out and discolouring the developing seed with no hole on the outside to warn you. Because the whole attack is concealed until you split or shell the pods, long-duration pigeon-pea — which carries green pods for many weeks in warm, humid weather — is hit the hardest.
Digvijaysinh Padhiyar · CC BY-SA 4.0 
Nanditha Gogate, WELL Labs · CC BY-SA 4.0
Why it matters
Pod fly is a hidden thief. Its little maggots grow up sealed inside healthy-looking pods, eating out the very seed you meant to harvest — and a bad attack can destroy up to half of your pigeon-pea seed. Because the damage happens inside a pod that looks perfectly fine from the outside, you often don't know it is there until you split the pods or shell the crop — and by then the seed is already ruined and no spray can reach the maggot. That is why late-maturing pigeon-pea, which stays in green pod for a long time, gets hit hardest, and why this fight must be won early — by choosing the right variety and stopping the flies before they lay.
When to act
Damaged seed found on splitting a sample of green pods, or adult flies present during podding on late-maturing crops
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 pod fly field guide
- Identify it
- Scout for it
- Control it
17 field-guide sections in the app
The full guide to pod 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 pod fly?
Outside the pod, nothing looks wrong — no hole, no chewing, no droppings. Pod fly hides all its damage inside, so your field can look perfectly healthy right up until you open the pods.
When should I take action against pod fly?
Damaged seed found on splitting a sample of green pods, or adult flies present during podding on late-maturing crops
How do I control pod fly?
Prevent first — choose the right variety. Grow an early- or medium-maturing pigeon-pea and, where you can get one, a variety with harder, tighter pod walls and a short podding window (the stretch of time the crop carries green pods). A crop that fills and matures its pods quickly escapes the peak of the fly, and tough pods are harder for the maggot to develop in. This is your strongest single tool — but on its own it only cuts damage by about a third to a half, so combine it with the steps below.
Which crops does pod fly affect?
Among the crops covered here: Pigeon pea.
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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