Sevin dust actually kills just about any insect. It is very lethal but also quite effective in the control of any pest. The problem with the use of this product is that it also kills the ‘good’ bugs. The ones you desire, such as ladybugs and spiders that eat mosquitoes. Use only when absolutely necessary. It’s very effective in flea control. Please use strong caution and safety measures. Wear eye protection and a mask when applying and wash thoroughly afterward.