ADVANCE FOR SATURDAY JULY 1 AND THEREAFTER -In a Wednesday, June 14, 2017 photo, curly-leaf pondweed in is seen East Okoboji Lake. near Orleans, Iowa. 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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