ADVANCE FOR SATURDAY JULY 1 AND THEREAFTER - In a Wednesday, June 14, 2017 photo, Mark Petersen runs an aquatic weed harvesting boat collecting curly-leaf pondweed in East Okoboji Lake. Invasive curlyleaf pondweed has been choking East Okoboji Lake, snarling boat propellers, burning up motors and shutting down swimming, tubing and other water sports in an area that depends on recreation.(Zachary Boyden-Holmes/The Des Moines Register via AP)
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