They feed on tomatoes as well as most garden vegetables. Entire plants may be eaten by these caterpillars if they occur in large numbers. These can be easily controlled by using Dipel, Thuricide, Bio-Spray or Biological Worm Killer. These materials contain the bacteria Bacillus thuringiensis that kills only caterpillars and does not harm beneficial insects. Good coverage of upper and lower leaf surfaces is necessary for best control.
Spider mites are the least detectable pest.
Spider mites are tiny spider like, plant chiggers that feed on the undersides of leaves of many garden vegetables and flowers. They reproduce rapidly and can damage plants in a short time. Inspect plants frequently by examining the underside of leaves with a magnifying glass. Spray plants with Kelthane with 1 teaspoon of liquid soap added to the mixture. Repeat the spray every 4 days for four consecutive applications.