Kills on contact and lasts for up to 8 weeks. Excellent control of bagworms, tent caterpillars, gypsy moths, budworms, oakworms, canderworms and many more. Our Twist and Shoot adjustable hose end sprayer delivers a 25 foot tall tree spray as well a gentle spray for low shrubs and bushes. Contains Lamda-cyhalothrin 0.5% concentrate. This formula contains a synthetic pyrethrin that disrupts the nervous system of insects leading to paralysis and death. This synthetic pyrethrin, lambda-cyhalothrin, is effective for longer periods of time than the naturally-occuring pyrethrum derived from chrysanthemum flowers.