Divisi
Jute semilooper
Anomis sabulifera · Insect
Photo: Alexey Yakovlev · CC BY-SA 4.0
The jute semilooper is the caterpillar (the young, worm stage) of a small straw-coloured moth, and it is the main leaf-eating pest of jute. The green caterpillars chew the leaves and, worst of all, bite off the soft growing tip at the top of the plant. Because jute is grown for the long fibre in its single main stem, losing that tip makes the plant split into side branches and ruins both the amount and the grade of fibre. It flares up in warm, humid weather and can strip whole plants bare.
Bernard DUPONT from FRANCE · CC BY-SA 2.0 
Bernard DUPONT from FRANCE · CC BY-SA 2.0
Why it matters
The jute semilooper is the worst leaf-eater of jute, and in a bad attack it can take up to 40% of your fibre. The real damage comes when it bites off the soft growing tip at the top of the plant: once that tip is gone the plant splits into side branches, and your fibre comes out short, knotty and low-grade instead of one long, clean strand. That harm to the fibre cannot be undone, and in warm, muggy weather the caterpillars multiply fast — so the whole job is stopping them before they reach the tips.
When to act
Around 2 to 3 caterpillars per plant or noticeable defoliation and biting of the top growing shoots on young to mid-stage jute.
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.
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The full jute semilooper field guide
- Identify it
- Scout for it
- Control it
12 field-guide sections in the app
The full guide to jute semilooper — 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 jute semilooper?
The damage (what you see first): ragged, chewed holes and torn edges on the young upper leaves. As numbers build the leaves get skeletonised — eaten away until only the veins are left — and whole plants can be stripped bare. The most costly sign is right at the top: the soft growing tip is bitten off and dies, and the plant answers by throwing out side branches instead of one tall, straight stem.
When should I take action against jute semilooper?
Around 2 to 3 caterpillars per plant or noticeable defoliation and biting of the top growing shoots on young to mid-stage jute.
How do I control jute semilooper?
Prevent it first (cultural): sow at the recommended time and spacing so the whole crop grows fast and evenly and passes the tender young stage quickly, and keep the field weed-free. Weeds and odd late-sown plants give the moths a steady supply of soft leaves to feed and lay eggs on, which keeps the pest going from one patch to the next.
Which crops does jute semilooper affect?
Among the crops covered here: Jute mallow.
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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