Oh! That is terrible. Take off the caterpillars from plants as you find them. I use neem oil and spray the leaves with it. It seemed to work well for me this year. There are a couple of other ways, but, this seemed to work well and it is organic. If you are looking for a homemade recipe, you can mix 2 tablespoons of canola oil, 1 teaspoon liquid soap and 2 cups warm water... put in a spray bottle and spray the caterpillars. Good luck!