Hey, Welder. I have to agree with Pat- the best method is to exclude them. My wife and I have observed that we have problems with all sorts of pests around the house in the city. Out in the country, everything is in balance. The birds or good bugs eat the bad bugs. We have a few wasps, but we try not to do indiscriminate killing. Why? When you kill the wasps, then you get web worms on the trees. The trees then die. The birds have no place to nest. The land then becomes a desert. Might as well be back in the city! We've been coming out to our country place for 2 1/2 years and have seen 2 mosquitoes. Every time I step outside in the city I inhale at least 2 of the boogers.