Identifying caterpillars on Tomato
Large ragged holes in leaves and sometimes bite marks directly in fruit, with caterpillars (including large hornworms) or dark frass visible on close inspection.
Life cycle
Egg → caterpillar → pupa → adult butterfly/moth. Several generations per year depending on species.
Damage to Tomato
Caterpillars, particularly tomato hornworms, can strip large amounts of foliage quickly and burrow directly into ripening fruit, causing significant crop loss.
How to treat caterpillars on Tomato
Hand-pick caterpillars (hornworms are large and easy to spot and remove), apply Bt (Bacillus thuringiensis) spray, which specifically targets caterpillars without harming beneficial insects.
Preventing caterpillars on Tomato
Inspect plants regularly for eggs and early-stage caterpillars, and encourage parasitic wasps, which are natural predators of tomato hornworms.