The first time they did it I used boiling water out of the lab to push them back. I'd fill up a half gallon stainless beaker at the darkroom sink and flood it over the mound. The floor back there has a slant. I really just wanted to see if it would work, and it cleaned up the mounds and collapsed them back under the floorboards. It DID work, but it took a week of hot water a couple times a day to discourage them. They stayed gone two years.
This season I hit them with Amdro. Yesterday. Treated them inside and outside the wall. This morning I checked and they seemed to be in a state of retreat. Many dead stacked outside the mound. I can probably sweep it up tomorrow.
Awful stuff. They are a non-native species so I'm not as sympathetic as I might be, even philosophically, to their extermination. Too bad we can't use Amdro on the mosquitos.
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