The best defense against Mother Nature is Mother Nature. Introducing STEM Kills Flies, Mosquitoes and Gnats – a bug spray for home and outdoor use made with botanical extracts that are deadly for bugs. STEM’s scientists decode the power of nature to use botanical extracts to effectively and safely protect your family, home and pets from pests (when used as directed). STEM plant-based active ingredient bug spray is formulated with botanical extracts to kill flies, mosquitoes and gnats. Our insecticide is safe for use around kids and pets (when used as directed). It has no added dye, fragrance, or harsh chemical odors and is made for indoor and outdoor use. This bug spray safe for use around kids and pets (when used as directed) was tested by entomologists.​STEM helps protect your family. Rooted in Nature, Optimized by Science.