Hey MLB,

I regularly use Avocet PLX to kill woody brush and willows around the edges of ponds. The chemical itself is approved for aquatic use and I have never had an issue with fish kill resulting in an Avocet treatment. If you plan on cutting them again, spray them real good at least 3 days ahead of time and also spray the little stumps again after cutting and you will slow down the regrowth tremendously.

Nate