Black Flag 64 oz. Fogger Insecticide. This EPA-registered, odorless insecticide is safe and effective for killing mosquitoes, including West Nile virus carriers, black flies, deer flies, horse flies, gnats, moths, fleas, and ticks. The fog disappears quickly and will keep treated areas insect-free for hours. It is for outdoor use only and can be used with Black Flag and Burgess foggers. The active ingredient is Sumithrin.