Not sure if it will work with bees, but a very affective way to get rid of ants is to make a slurry using sugar and Borax and place it in a container with a small hole just large enough for the insects to get through. The workers will take it back into the hive and it kills off the queen and the rest of the critters will leave immediately. Just leave the bait traps out long enough to get rid of them and you won't have to worry about possibly harming the lake water
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