My experience has been otherwise. It won’t kill eggs either. The original poster will be dealing with the problem all season. It’s the mildest “discouragement” to insects, if anything. If it takes weeks to have any effect, it doesn’t really work that well.
Pertaining to the original poster, Malathion works great for most things. It smells absolutely god-awful though, like a smoldering port-o-potty. I’d use Temprid SC. If you’d rather use organic methods, give nicotine sprays a try. Soak a bag of beech-nut in a gallon of warm water. Apply as a foliar/root drench. Earwigs won’t survive.