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Aggressive treatment planned for Eurasian watermilfoil found in Iowa’s Lost Grove Lake

Eurasian watermilfoil was discovered in Lost Grove Lake in mid-May. (Map courtesy of the Iowa DNR)

The Iowa Department of Natural Resources will start treating Lost Grove Lake in Scott County at the end of June with the approved aquatic herbicide Sonar A.S. to eliminate Eurasian watermilfoil.
Sonar A.S. has successfully eradicated Eurasian watermilfoil from other lakes in Iowa by preventing the plant from producing a pigment needed for photosynthesis, starving the plant over several weeks. The herbicide has no restrictions for swimming, fishing, irrigation, or drinking water at the planned dose. 

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