I have a 1-acre, 30-foot deep pond stocked with fish (bass, cat-tail etc.), and ducks and goats etc.

Water Primrose all over the shore. Two years ago, we had a backhoe scrape about 10 foot into the water out (when water level was down a little). And I try to keep it clear but every year it comes back.

Last year, I tried to hand-weed and some insect living on there bit me all over (welts all over my body since I was in the water to take the weed out).

I would love any advice on how to at least manage it. Pond slopes gently down to about 30' in the middle. Weed grows out to about 10' from the edge. I live in Northern California. Trying to stay away from Chemicals given livestock...

Thanks,
-Ed