Full strength DE for indoor/outdoor insect control In homes, barns, stables, vegetable and flower gardens. This mechanical mode of action works by contact and by ingestion. Insects cannot become immune to its action. Bedbugs, Asian lady beetles, box elder bugs, mites, ants, flies, fleas, spiders, other beetles and crawling insects all succumb within 24-48 hours of contact. Apply as a dust or a slurry. All natural and earthworm safe.