Invasive Aquatic Plant Treatment/Removal at Coes Reservoir

The City of Worcester Department of Public Works & Parks has contracted a lake management company to battle the weeds in Coes Reservoir. The Tatnuck Brook Watershed Association appreciates the City’s continued efforts to combat the various invasive aquatic plants in Coes.

On June 28, Coes Reservoir was treated with the herbicide fluridone (trade name Sonar). Fluridone treatments are a safe and effective method to control the growth of the invasive aquatic plants Myriophyllum spicatum and Cabomba caroliniana, also referred to as Eurasian milfoil and fanwort. The application of this herbicide is a common practice to reduce invasive weed density and poses no risk to humans and animals after application is complete, though water use for irrigation is discouraged.

Mechanical harvester removing water chestnut, July 8, 2019

The week of July 8, mechanical harvesting of water chestnut (Trapa natans) will be conducted in the northern portion of the Reservoir. Mechanical harvesting has proven to be a safe and effective method for the control of water chestnut without the use of aquatic herbicides.

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