Bengal Yard & Patio Outdoor Fogger kills flying, biting and crawling insects for 24 hours and prevents spiders from building nests for up to 30 days. It is highly effective on spiders as a killer and a repellent. Kills mosquitoes, ants, flies, gnats, spiders, scorpions and moths for 24 hours. Prevents spiders from building webs for up to 30 days. Keeps killing as insects land on treated surfaces. Quick knockdown of insects.