On Tuesday, May 29 an area of Crystal Lake will be treated with an herbicide to control invasive aquatic plants. Hey and Associates, the company working with the Crystal Lake Park District on the management of Crystal Lake will be treating the area in the north cove of the west end between the inlet channel and the point. A granular aquatic herbicide called Hydrothol 191 will be applied to the standing crop of Curlyleaf Pondweed and the emerging Eelgrass.

Treatment of Eurasian Water Milfoil was successfully completed approximately two weeks ago. There are no swimming or fishing restrictions associated with the Hydrothol 191 herbicide application. The complete list of restrictions is as follows:

Water Use Restrictions for Hydrothol 191

Active Ingredients: Dimethylalkylamine salt of endothall

Weight % Active Ingredient: 11.2, EPA Reg. No. 4581-172-82695

Restriction Time Frame (# of days)

Human Drinking 7-25 days

Human Swimming 0 days

Human Fish Consumption 0 days

Animal Drinking 7-25 days

Turf Irrigation 7-25 days

Forage Irrigation 7-25 days

Food Crop Irrigation 7-25 days