If there is only one caterpillar (or a few), physical removal will prevent damage. This insect is parasitized by a number of insects. One of the most common is a small braconid wasp. Larva that hatch from wasp eggs laid on the hornworm feed on the inside of the hornworm until the wasp is ready to pupate. The cocoons appear as white projections protruding from the hornworm's body. If such projections are seen, leave the infected hornworms in the garden. The wasps will kill the hornworms when they emerge from the cocoons and will seek out other hornworms to parasitize.
Bt (Bacillus thuringiensis) and other insecticides may also be used to control hornworms. Contact your local Extension office for insecticide recommendations.
