• The favorite host of the tomato hornworm is the tomato plant.tomato image by YN from Fotolia.com
  
  If you've ever encountered a tomato hornworm in your garden, it was likely a memorable experience. Adult hornworms, which are actually caterpillars, tend to be alarmingly large and come equipped with a horn protruding from the last abdominal segment or tail. Mature green hornworms can measure five inches in length. Hornworms sport white V-shaped markings along segmented sides. While tomato plants are a favored food, hornworms have been found on other garden plants.
  
  

Potato

• Hornworms have been known to migrate from tomato plants to potato plants.Potato Blossoms image by Paul Coskery from Fotolia.com
  
  According to the University of Minnesota Extension, tomato hornworms also can be found feeding on the leaves of potato plants. You'd be advised to check potato plants in your garden and once hornworms have been found, hand pick them daily immersing them in soapy water prior to disposal. The hornworm can't survive in soapy water. This is an effective method to keep them clear of migrating to other vegetable plants in your garden.
  
  

Eggplant

• The leaves of eggplants can also attract the errant hornworm.eggplants image by Kristina Cilia from Fotolia.com
  
  Eggplant is another vegetable plant reported by the University of Minnesota Extension as an occasional host for the tomato hornworm. Till the soil at the end of each planting season to destroy burrowing caterpillars or pupae prior to planting seasonal vegetables. Destroy any hornworms found on neighboring tomato plants to eradicate the pests from your garden during active growing season.
  
  

Pepper

• Pepper plants, often planted seasonally along side tomatos, can host hornworms.red and green pepper image by AGphotographer from Fotolia.com
  
  Pepper plants, often planted in conjunction with tomato plants, have also been found to be a feeding station for the hornworm. The Old Farmer's Almanac recommends interplanting dill or marigolds to fend off the harmful hornworm. The University of Minnesota Extension offers further advice for garden hornworm control. They recommend keeping your garden soil tilled and free from weeds as a deterrent.