Action 500 is an organophosphorus insecticide containing Chlorpyrifos 50 %EC as active ingredient. Action 500 is a broad spectrum insecticide used to kill a wide variety of insects. Action 500 is effective in controlling cutworms, corn root worms, root grubs, flea beetles, caterpillars, etc. It is used as an insecticide on cereals, cotton, field, fruit, nut and vegetable crops, and well as on lawns and ornamental plants. Action 500 acts on pests primarily as a contact poison, with some action as a stomach poison.