I used praying mantis to completely rid my garden of tomato horn worms. The first year using this method also eliminated all other bugs in the garden including the ladybugs.Those nasty worms eat my entire tomato crop (24 plants) in 2 days this year.. Get rid of them one way or another. Feed to the birds or kill them. And be sure to check your plants over for the next several days because they blend very good with the stalk of the plant and you can easily miss them.
Good luck!