Here’s the solution for your tomato horn worm problem! It’s that thing you forget to buy as you select plants and then are woefully reminded you need it when big green tomato worms devour your plants! Bt is a naturally occurring bacillus that shuts down the digestive system of hornworms, many a tomato garden’s most aggressive pest. Measure and mix this concentrate and spray it before you see them, that’s the key. Don’t forget this year!