Tomato hornworms are a large caterpillar that feeds on many parts of the tomato plant. Because of their large size, they can rapidly defoliate tomatoes, potatoes, eggplants, and peppers. Handpicking is one method of controlling this highly destructive pest. You can also apply
Dipel DF (OG) (bacterium Bacillus thuringiensis subsp. Kurstaki), as a biological method certified for organic production to control tomato hornworms. The adult stage is a brown and gray hawk moth known as the five-spotted hawkmoth, (Manduca quinquemaculata; family Sphingidae).