GoGnats adopts cedar oil to safely control fungus gnats, mites, thrips, aphids, whiteflies, moths, mosquitoes and more. Gardeners can mix liquid concentrated GoGnats as a foliar spray, or add it directly to a hydroponic reservoir for systemic treatments. Great for use indoors and out, this natural pesticide also comes in handy for establishing a preemptive pest-free perimeter.