Safer Brand Caterpillar Killer Concentrate uses a naturally occurring bacterium to kill and control caterpillars and other leaf-eating worms. The caterpillars and worms that are damaging your plants will stop feeding immediately after ingesting the bacterium, which is known scientifically as Bacillus Thuringiensis var. Kurstaki (B.t. for short). Plus, when Caterpillar Killer is used as directed, it has no effect on birds, earthworms or beneficial insects such as honeybees and ladybugs. This economical concentrate is easy to mix into a ready-to-use solution. And because Caterpillar Killer is OMRI Listed and compliant for use in organic gardening, you know that you're controlling leaf-chomping caterpillars in a way that fits into your organic garden plan. Fruits, vegetables, shade trees and ornamentals are all susceptible to the damage from worms and caterpillars. These nuisance pests will eat their way through foliage and cause irreparable damage to plants extremely quickly. That's why it's important to stop these caterpillars and worms right away with Safer Brand Caterpillar Killer. Eliminate a variety of caterpillar & worm species. Visible damage from each will be different. Tomato hornworms eat entire leaves, stems and the fruit of the plant, causing it to look like someone took a bite. Other worms, like tent caterpillars & fall webworms, form webs on trees & shrubs resembling white bags made of spiderwebs. Below these "tents" are dozens of caterpillars eating the leaves. Safer Brand Caterpillar Killer controls and eliminates a variety of destructive caterpillars and worms. When used as directed, this treatment won't harm birds, earthworms and beneficial insects, such as honeybees and ladybugs. These beneficial organisms are important to our ecosystem and their survival is vital to the continued production of nutrient rich soil and the natural pollination process of flowers, fruits and vegetables.