Concern 4 lb. Diatomaceous Earth Crawling Insect Killer 970642 Kills earwigs millipedes centipedes silverfish cockroaches and ants Lightly coat a thin layer in area where pests are found or may hide such as cracks and crevices Effective long lasting and organic Concern diatomaceous earth crawling insect killer Diatomaceous earth is made from the finely ground fossils of prehistoric fresh water diatoms Kills common household and garden pests like bed bugs, roaches, ants, fleas, beetles, and other listed insects A long lasting organic pest control, diatomaceous earth sprinkles into cracks and crevices where bugs hide Kills insects that come into contact or ingest the powder within 48 hours