Answer: The caterpillars on your tomato plants are tomato hornworms, the larvae of a Sphinx moth. These huge, huge caterpillars can devour an entire tomato plant in a single day! It's best to hand pick the creatures but you can also use Bt (bacillus thuringensis) which is sold as Dipel or Thuricide. It is a bacterium which acts as a stomach poison and targets only caterpillars. It is safe around people and pets. Good luck with your tomato plants.
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