Outdoor Spray that Kills Hornets, Wasps & Yellow Jackets. With a foam-trapping action, the spray quickly kills wasps and hornets on contact. It has a powerful jet spray that can reach up to 25 feet. The water-based foam will kill insects returning to the nest for a thorough and optimal extermination performance. It's safe on most ornamental plants and shrubs and will not stain most home siding and asphalt shingles depending on the condition and cleanliness. The foam contains a 0.5% concentration of its active ingredient, Permethrin, an insecticide that is a powerful killing agent on insects. From a safe distance, treat by soaking the nest during early morning or late evening hours for the best results. Majority of the insects will be resting on the nest during this time. Do not spray this product on electrical equipment.Keep your surroundings free of wasps, hornets, and yellow jackets with the Bengal Foaming Wasp & Hornet Killer.