skinnybass:

If you can get your hands on some Pounce Insecticide, that will work on ground nests. It's really toxic to bees and wasps, they'll pick it up by walking over the sprayed area. I've killed ground nests of yellow jackets with the stuff.

www.hoosierpondpros.com

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).