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Lake Okeechobee Day1. .Gray, dead stalks are all that remains of cattails sprayed for.eradication by the Army Corps of Engineers. Cattails have always existed.on Lake Okeechobee, but the plant has reached infestation levels because.of the unusually high concentrations of nutrients in the water..Ultimately, the cattails have begun to choke out the other grasses.needed to support Lake Okeechobee fauna. While most agree that the.spraying is beneficial, some believe leaving the sprayed stalks in the.lake adds to the problem of poor water quality. .Erik Kellar/Staff