Monterey BT ideal for caterpillar killer. Larvacide. Can be applied as foliar and watered in. Controls Worms & Caterpillars on Vegetables, Fruits, Shade Trees & Ornamentals  in and around your home garden or hydroponics grow. Should be applied when caterpillars or worms are first noticed. A fast-acting microbial insecticide spray for controlling caterpillar infestations. Buy Monterey BT for your garden from the best hydroponics store in California Desert Grown Organics.