Its supposded to work for all pest. But it really doesnt. Mainly them smaller fuckers like aphids gnats and most mites. Any time i get bugs in flower i just toss them because its not worth keeping 1 infested plant and seperating it from 30 other females not to mention i grow organically, once you treat organic soil for bugs its hard to not change the taste of the harvest. However, if you are limited on females and really want to smoke that harvest then you would have to stick to organic measures to deter pest and it will be you're only way to flower with organic soil i believe.