Divisi
Rice bugs
Leptocorisa oratorius · Insect
Photo: Jeevan Jose, Kerala, India · CC BY-SA 4.0
Rice bugs (Leptocorisa oratorius) are slender, grass-green to straw-brown sucking insects — about 1.5 cm long, with very long thread-like legs and antennae — that attack rice from heading through the soft, milky-grain stage. Both the wingless green young (nymphs) and the winged adults pierce the filling grains and suck out the milky contents, leaving empty, shrivelled or brown-spotted 'pecky' grain. Disturb them and they give off a sharp, foul stink — often the quickest way to know they are in your field.
Jeevan Jose, Kerala, India · CC BY-SA 4.0 
Maulidya Fachra · CC BY-SA 4.0
Why it matters
Rice bugs feed at the exact moment your grain is filling, so their damage goes straight into your harvest — a bad infestation can take up to 40% (nearly half) of your yield. They don't only empty the grains; the shrivelled, brown-spotted 'pecky' grains that survive fetch a lower price at market. And because the bugs breed on grassy weeds and fly in from neighbouring fields, once they build up across the area they keep re-invading — so it is far easier to stop the build-up early than to chase them once the heads are full.
When to act
about 1 bug per hill (or 5 bugs per 10 sweeps) during heading to milk stage
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 rice bugs field guide
- Identify it
- Scout for it
- Control it
13 field-guide sections in the app
The full guide to rice 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 rice bugs?
The damage shows first — look at the grain heads. At the top of the plant the panicle (the head that carries the flowers and grains) fills with empty or half-empty grains that stand upright instead of bowing over with weight. The grains that do fill carry brown or black spots and stained, shrivelled kernels — farmers call this 'pecky' rice. A sharp, foul smell hanging over the crop is often the very first clue, before you even spot a bug.
When should I take action against rice bugs?
about 1 bug per hill (or 5 bugs per 10 sweeps) during heading to milk stage
How do I control rice bugs?
Prevent the build-up — this is your strongest tool. Agree with your neighbours to plant the same variety at the same time, so every field flowers and fills grain together. Staggered or late planting gives the bugs a long, moving buffet and lets their numbers explode; synchronised planting keeps the vulnerable window short and shared across the whole area, so no single field is left standing as the last green target.
Which crops does rice bugs affect?
Among the crops covered here: Rice.
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.
Check what grows on your farm