Caterpillar Killer Spray with Bt is a natural, biological insecticide. Non-toxic to humans, pets and beneficial insects. Use on Vegetables, Fruits, Ornamentals and Shade Trees to control leaf chewing worms like Tomato Hornworm, Gypsy Moth, Cabbage Looper, Tent Caterpillar, Imported Cabbage Worm, Bagworms and others list on label.