Bonide® Captain Jack’s™ BT Thuricide Liquid Control controls worms and caterpillars on fruit, vegetable, and ornamental plants with BT (Bacillus thuringiensis). The worms and caterpillars eat the treated foliage, then immediately stop feeding on and damaging the plant. When used as directed, it does not harm birds, earthworms, or beneficial insects such as bees or ladybugs. Can be used in organic gardens and applied up to the day of harvest.