Hot weather causes the carbon monoxide to come out of the ground. That movement upwards causing it to pull mud and dead grass with it to the surface. It sits on top of the water and begins to clump up and form beds that are very rich for marsh grass to grow. We keep ours back out of the pond by spraying 2-3 times a yr at the edges of trails and ponds with diquat. Haven't had a problem one. Just have to keep up with it. It's a full summer time job. Spraying and running trails. If you want to hunt though it's the cheapest thing to do. Plus I have a buddy with a marsh buggy and a roller and a bush hog on it. That always helps too.
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