Caterpillar killer foliar spray. Containing the active ingredient Btk, this product will completely eliminate pests without harming any  earthworms, birds, and beneficial insects. Summit Biological Caterpillar & Webworm Control is a non-toxic, organic insecticide that effectively controls caterpillars, webworms, and worm stage insects on trees, fruits, ornamental foliage,  and vegetables up to and on the day of harvest. Very effective. Immediately treat foliage and stop feeding activity of pests on your plants. For a variety of caterpillar pests on most vegetables, ornamentals, and shade trees. Apply at first sign of activity and repeat as needed up to harvest. Best applied in the afternoon as Bt breaks down in direct sunlight. Kills caterpillars, gypsy moth larvae, cabbage loopers and worms . Safely eliminates caterpillars and various other insect pests from your plants or garden efficient and safe.