By Paul Schnare
Saturday, June 14, 2003
Hornworms are the larvae of the huge sphinx moth. They can get up to 4” or 5” long and get to be about ¾” in diameter. They are green with white stripes and have a small horn on the top of the head.
Hornworms overwinter in the soil as pupae. The adult moths emerge in late spring through summer. The female lays eggs at night on the underside of leaves of tomato, pepper, tobacco, and potato. The larvae hatch in 4 to 5 days and begin feeding. They are voracious eaters.
They are hard to find on tomatoes because they blend in with the foliage so well. You can control them by picking them off. You can also dust your tomatoes with sevin, thiodan, or Bt, and get very good control.