Tree Tanglefoot Pest Barrier is effective against crawling insects who must reach the tops of trees in order to feed, mate, or deposit eggs. Such insects include cankerworms, gypsy moth caterpillars, army and tent caterpillars, ants, obscure root weevils and pecan weevils, tussock moths and climbing cutworms. Tree Tanglefoot Pest Barrier provides the perfect solution to protecting your valuable trees and reducing future populations of these pests. As the insects climb up over the sticky material, they become trapped without escape. Best of all, the action is strictly mechanical - no pesticides or harmful chemicals are involved.