I think they're coming here from out that way?

I live in and maintain an apartment complex in Kennebunk, Maine. This year, they are the worst they've ever been, swarming into the building, infesting people's apartments in the 1st floor and basement levels.<br><br>I think they're coming from the marshland out back, but I really don't know for sure. Still, I'm going to get out there and spray the walls, then move out to the spots where the walls meet the ground and spray a 2-3 foot wide band around that area.<br><br>I'm hoping this will help some, at least.<br><br>What do you guys think? Am I going down the right road here? Should I try something else? Your feedback is most welcome.<br><br>And thank you!<br><br>Dan