I am not looking to eradicate this plant, just control it. I have shallow littorals(max 20") that extend out about 10' around my lake. Slender spikerush covers 100% of my littoral shelf. As the Slender spikerush reaches the water surface it just seems to break off and form large mats of algae and floating Slender spikerush. At times more than 50% of my lake is covered with this. Any ideas of a more effective way of treatment?