Belgrade Stream Herbicide Treatment

Good news to share from Belgrade Stream…

On August 31st, a small portion of Belgrade Stream was treated with a low-risk herbicide to reduce invasive variable-leaf milfoil, hoping to lower the risk of its spread into Long Pond, and improve ecological conditions below Wings Mills Dam.

A few important reminders for you:

👉 The effects of the treatment will not be visible for several weeks. 

❌ Do not remove any rooted vegetation as they need to fully absorb the herbicide for it to be effective. 

💦 There are no drinking water or swimming restrictions. 

🌱 Out of an abundance of caution, for 3 days following treatment, do not water your lawn with lake water if you are within 1,000 ft of the treatment areas. 

❓For questions and concerns, please contact Sharon Mann, 7 Lakes Alliance Invasive Aquatics Director and project manager at sharon@7lakes.org


  • ProcellaCOR is an aquatic herbicide that targets milfoil while minimizing impacts to most native plant species.
  • It has been used for decades to control weeds in rice paddies grown for human consumption.
  • Extensive toxicity testing conducted for EPA review found ProcellaCOR to be practically non-toxic to fish, birds, mammals, and aquatic invertebrates when used within permitted concentrations.
  • It works at very low concentrations and is rapidly absorbed by targeted plants.
  • ProcellaCOR has been used successfully in several Maine lakes, including in Great Meadow Stream (Great Pond), where milfoil was reduced by over 97%.

We know you have questions. Here are some answers.


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