Posted by Robert on 11:36:56 5/15/2012 from 188.8.131.52:
We've had low levels of carpenter ants in our finished basement since we moved in 9 years ago. The basement has laminate flooring over some kind of subfloor, and the ceiling is fully open/exposed. No swarmers to date, and I'm trying to keep it that way. We've had few ants upstairs in past years. But we started to see them this year as early as February in the basement. I pulled back some vapor barriers and insulation in the basement ceiling and found what looks like a satellite or main nest nearby behind a closet facing the front wall/foundation under our porch. There is foam-type insulation in that area and the spray can (yellow) stuff -- they are around there, seemingly in the yellow stuff and possibly in the foam. They emerge through baseboards on the floor of the basement. No apparent significant moisture issues or primary food sources. Other areas of the basement may have small nests, but it is very difficult to tell -- I am only certain of the primary nest site. We live in a wooded neighborhood in Ontario (Canada). We have limited options in Ontario. No exterminators around here are allowed to use Termidor or Phantom. I purchased Termidor online and sprayed at the correct (lowest level) concentration around the foundation three weeks ago -- but I'd seen virtually no activity outside for months before, or now. Initially (7 weeks ago), I sprayed Phantom -- from in the aerosol can only -- around the baseboards and into the foam areas and any accessibly openings. It seemed to have limited impact. Three weeks ago, I "might" have also sprayed targeted areas with Termidor indoors (and I might have sprayed some newspaper and put that in their foraging trails). And I put out Maxforce bait in several locations. Three weeks later and we still have ants. Initially (and it's not clear if it was the warm weather or the spraying), the ant count went WAY up -- hundreds per day, most dying on the floor, but some looking just fine. I have vacuumed up thousands by now. The numbers declined after that initial rush, but since have remained steady; we continue to vacuum 30ish a day. I'm at my wits end on what to do next. Give it more time? Dust?
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