Diatomaceous Earth from Natural Guard in an easy-to-use bottle! Diatomaceous Earth is a contact insecticide that works by causing abrasions on insects as they come in contact, resulting in loss of body fluids, then dehydration. Use Diatomaceous Earth indoors or out to control a wide number of crawling insects such as cockroaches, ants, earwigs, crickets, millipedes, centipedes, silverfish, fleas, bedbugs, grasshoppers and slugs. Long lasting when kept dry. Digestible by earthworms, causing them no harm. 7 oz. bottle.