Divisi
Pod-sucking bugs
Clavigralla tomentosicollis · Insect
Photo: Vengolis · CC BY-SA 4.0
Pod-sucking bugs are a group of shield- and stink-bug-type insects — the commonest being the spiny brown bug — that attack cowpea, pigeon pea, common bean and soybean. Instead of chewing leaves like a caterpillar, they stab green pods with a needle-like beak and drink the developing seeds, injecting spit that shrivels the seed and lets mould in through the wound. Adults and their wingless young feed shoulder to shoulder on the pods through flowering and pod fill, and give off a sharp, foul smell when you disturb them.
Jovo26 · CC BY-SA 4.0 
Kottakkalnet · CC BY-SA 4.0
Why it matters
Pod-sucking bugs go straight for the part you actually harvest — the seeds inside the pods. A bad attack can wreck up to 60% of your crop, leaving pods full of shrivelled, stained, worthless seed that won't sell, won't store, and won't grow if you save it for planting. They are hard to beat once they settle in: adults fly in from weeds and neighbours' fields and breed on your pods, and by the time you see the shrunken seed the damage is already done inside the pod — you cannot un-suck a seed. Your one real win is catching them early, at flowering, before the pods fill.
When to act
About 2 or more bugs per metre of row (or per 10 plants) during flowering and pod fill
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-sucking bugs field guide
- Identify it
- Scout for it
- Control it
12 field-guide sections in the app
The full guide to pod-sucking bugs — 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-sucking bugs?
The damage shows first — check the pods. Look for tiny dark, sunken spots where the beak went in, and inside, shrivelled, shrunken or stained seeds (often brown- or purple-blotched). Badly hit pods stay flat and empty, bend or curl, and dry out early while the rest of the plant is still green — and a grey or black mould often grows right at the puncture spots.
When should I take action against pod-sucking bugs?
About 2 or more bugs per metre of row (or per 10 plants) during flowering and pod fill
How do I control pod-sucking bugs?
Prevent — start clean and early (cultural control). Plant early and all at once with your neighbours, so your pods fill and are ready before bug numbers build up. Clear the weeds in and around the field all season — wild legumes and other weeds are where these bugs breed and shelter between crops. And harvest as soon as the pods are mature: bugs pile onto the last drying pods left standing in the field.
Which crops does pod-sucking bugs affect?
Among the crops covered here: Common bean, Cowpea, Pigeon pea, Soybean.
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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