Tomato Hornworm

The Tomato Hornworm is the caterpillar of the brown or gray hawk moth and is commonly found throughout North America. It is one of the most destructive pests affecting tomato, potato, pepper, and eggplant plants. These caterpillars consume entire leaves, small stems, and sometimes even parts of the fruit. They blend in with the plant canopy, making them difficult to notice until significant damage has occurred. As they feed, they produce dark green or black droppings that can be quite noticeable.

The most effective way to manage hornworms is by handpicking them from infested plants. Because of their large size, they are relatively easy to find. Once collected, simply throw them into soapy water to eliminate them.

Natural predators of hornworms include parasitic wasps, which lay their eggs on the hornworms' backs when discovered. It's beneficial to leave these affected worms in the garden so that the emerging wasps can parasitize other hornworms.

Insecticides are typically unnecessary for hornworm control. However, if handpicking and natural enemies are insufficient, you may consider applying a pesticide. We recommend using Bonide Insecticidal Soap or Bonide BT Thuricide Spray RTU.

At the end of the gardening season, till the soil to eliminate any overwintering larvae, and repeat this process in the spring.