I had a problem with a yellow jacket hornet's nest forming in the sidings of my house. While the hornets were passive, the proximity to my main entrance was concerning and needed to be delt with. This product, while not killing the hornet right away, was effective at keeping them away. You could tell they really didn't like it and spend all day trying to get rid of it. If you buy a duster with it, the powder stick to walls and surfaces effectively blocking their entries to their nest. Took multiple reaplies as the hornets kept finding new path to their nest but over 2 weeks the nest was fully abandoned.