See label. We have bug killers that work on ants, roaches, spiders, flies, wasps, hornets, yellow jackets, gnats, or fruit flies. However, each bug spray is designed to work on specific bug types, so check each product to see which specific insect(s) it kills. Our repellents are a bit more straightforward – some are effective against mosquitoes, and others are effective against mosquitoes AND ticks, when used as directed!