Like Cindy's, our yard is bordered by "wooded wetlands" (aka cedar swamp in my case), so we have lots of mosquitoes and yes, they do seem to love the GH ! I've never done anything about them, (other than spraying myself with "Off") but that fogger that Ken mentioned sounds like a good idea to me. It seems that I've had so many bites over the years that I no longer get any kind of reaction to them, but even if they didn't spread West Nile they are just so darn annoying!!