SaferŪ Brand Caterpillar Killer II with B.t. (bacillus thuringiensis var. Kurstaki) is an effective organic solution for caterpillar and worm control. Caterpillar Killer II kills worms and caterpillar stage insects, but has no effect on birds, earthworms, or beneficial insects, such as honeybees and ladybugs, when used as directed. Worms and caterpillars eat treated foliage then immediately stop feeding and damaging plants. Effective for: corn earworm, bollworm, armyworm, diamondback moth, green cloverworm, hornworms, loopers, melonworm, pickleworm, tomato fruitworm, tobacco budworm, salt marsh caterpillar, mimosa webworm, and imported cabbageworm.