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What does a tomato hornworm look like?

The two-inch-long green caterpillars of a large moth. Pluck them off and drown them in soapy water. But if a caterpillar has white knobby growths on it, leave it be. You are getting help from a parasitic wasp that has laid its eggs in the caterpillar's flesh. As the eggs hatch, baby wasps will eat the worm. 

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