Tomato Hornworms
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The hornworm moth and its pupa are pictured.The best control method for tomato hornworms is to pick off and destroy the caterpillars. Sometimes they are hard to spot on your plants, since they are the same color as the plant. Mist your tomato plant in the morning and watch for shaking leaves - the hornworms move when wet.
Small caterpillars of all kinds can be controlled by applications of Bacillus thuringiensis (Bt) applied to the surfaces where the caterpillars feed. Bt is a microbial insecticide.
Another insecticide effective against small caterpillars is Spinosad, found in many ready-to-use commercial products for homeowners.
More information about control of tomato hornworms.