Hornworms on tomatoes
There are several different types of caterpillars that will feed on tomatoes. The most well-known, and probably most dreaded, are the tomato (Manduca quinquemaculata) or tobacco (Manduca sexta) hornworms. These large (up to four inches long) green caterpillars have a prominent “horn” on their rear end (thus their name) and can do quite a bit of damage to tomato plants.
Hornworm damage usually begins to occur in midsummer and continues throughout the remainder of the growing season. Because of their size they can quickly defoliate tomatoes and less commonly potatoes, eggplants, and peppers. They may also occasionally feed on green fruit.