Tomato hornworms are entirely green in appearance. ... If you are a gardener, and if you ever spot a hornworm sporting these white spikes, then you should not kill them, but instead let them die on their own. These white protrusions are actually parasites. To be more clear, these parasites are braconid wasp larvae.

What should I do with tomato hornworm?

If the hornworm population or the area of your garden is too large, insecticides can be effective, though they should be a last resort. You can use the organic pesticide Bt (Bacillus thuringiensis), which is a bacterium that acts as a stomach poison on some larval insects (but doesn't harm other plants or animals).

Are tomato hornworms good for the environment?

Tomato Hornworms are really big green caterpillars that can munch through and devastate your vegetable garden.