I have wanted to post a picture of these guys since I started the blog, and finally got some photos this year. I find it impossible to see these worms (they blend in with the plants perfectly) except when one of the wasps has laid its eggs on it. The first year or so that I grew tomatoes I had an awful problem with these worms eating them up and just devastating my crop. Luckily, their natural predators, the braconid wasp, came to the rescue. Since then we have not had any problem, as the wasps seem to find all of the hornworms and dispense with them (that is, by laying its eggs inside the worm, which then produce the cocoons you see in the picture).