Divisi
Tobacco budworm
Chloridea virescens · Insect
Photo: Whitney Cranshaw, Colorado State University · CC BY 3.0 us
The tobacco budworm is the caterpillar (young feeding stage) of a small, night-flying moth, and a close cousin of the cotton bollworm and tomato fruitworm. The moth lays its eggs one at a time on the tender growing tips, buds and flowers; the caterpillars that hatch first chew the soft new growth, then bore inside buds, flowers, tomatoes, peppers and cotton bolls, where they feed hidden from view. It attacks tobacco, cotton, tomato, pepper and beans, thrives in warm weather (about 20-32 degrees C), and is infamous for shrugging off older insecticides - so it is a pest you beat by prevention and early action, not by spraying late.
User:SB_Johnny · CC BY-SA 3.0 
Andy Reago & Chrissy McClarren · CC BY 2.0
Why it matters
Tobacco budworm goes straight for the parts you sell - the buds, flowers, fruit and cotton bolls - and a bad attack can wipe out up to half your crop (50%). The real danger is that the young caterpillar soon bores inside a bud, boll or fruit, where no spray can reach it, and this pest has already beaten many older poisons, so it is very hard to kill once it is established. Your one good chance is to catch it early, while the eggs and tiny caterpillars are still out in the open on the growing tips.
When to act
Treat when eggs and young larvae reach the crop threshold, for example when several plants in a sample carry fresh larvae in buds or terminals before caterpillars bore into protected fruit and bolls.
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 tobacco budworm field guide
- Identify it
- Scout for it
- Control it
18 field-guide sections in the app
The full guide to tobacco budworm — 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 tobacco budworm?
The first thing you see is the damage. The tender growing tips, buds and young leaves at the top of the plant look chewed and ragged, with small holes. Soon comes the giveaway sign: a round hole bored into a flower bud, a tomato or pepper, or a cotton boll, usually plugged with frass - the caterpillar's droppings, which look like damp sawdust - at the entrance.
When should I take action against tobacco budworm?
Treat when eggs and young larvae reach the crop threshold, for example when several plants in a sample carry fresh larvae in buds or terminals before caterpillars bore into protected fruit and bolls.
How do I control tobacco budworm?
Prevent it first. Plant early and all at once, ideally together with your neighbours, so your buds, flowers and fruit form and firm up before moth numbers build to their peak later in the season. A budworm that arrives to find hard, setting fruit does far less harm than one that arrives to soft new buds.
Which crops does tobacco budworm affect?
Among the crops covered here: Common bean, Cotton, Tobacco, Tomato.
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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