Summit's Biological Caterpillar and Webworm Control is an Easy-to-Use Ready to spray Concentrate. The active ingredient is Bacillus thuringiensis subsp. kurstaki (BTK), a species specific biological larvicide that kills only leaf eating caterpillar pests (Lepidoptera).
Biological control for destructive caterpillar pests
Will not harm birds, earthworms, or beneficial insects such as honeybees and ladybugs OMRI listed and approved for use in organic gardening
May be used on edible plants, fruits, and vegetables up to day of harvest
Same active ingredient as "Dipel" and "Thuricide"