If left unchecked, they can defoliate a tomato plant. Hornworm larvae can devour up to four times their weight in leaves and fruit each day. Symptoms and Effects: Hornworm larvae primarily feed on tomato leaves but occasionally feed on green fruit. Note the reddish spine (horn) protruding from the insect’s rear. Adults are often mistaken for hummingbirds due to their large size, rapid wingbeats and quick movements. Adult hornworms are large, heavy-bodied hawkmoths with a wingspan of up to five inches. A large red or black horn-like spine protrudes from the posterior (rear) end of caterpillars, giving rise to the name “hornworm”. Tobacco hornworms and tomato hornworms have seven or eight diagonal white stripes, respectively, on each side of their bodies. However, smaller hornworm larvae, due to their color, tend to blend in with plant leaves and can be difficult to detect.

When fully grown, hornworm caterpillars (larvae) can be up to four inches in length and easily seen.

These insects can also feed on solanaceous weeds such as horsenettle, jimsonweed and nightshade.Īppearance: You can easily identify hornworms by their blue-green color and large size. Tomato and tobacco hornworms feed only on solanaceous plants (i.e., plants in the nightshade family), most typically tomato and less commonly eggplant, pepper and potato.

However, large numbers of larvae can occasionally occur in home gardens, leading to significant damage. These insects do not typically cause significant damage in commercial vegetable fields. sexta) are large, blue-green caterpillars (larvae) with a spine (horn) on the posterior (rear) end. Tomato hornworms ( Manduca quinquemaculata) and tobacco hornworms ( M.

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