Treatment Schedule

In 2026, both a liquid formulation (Sonar Genesis) and pellet formulation (Sonar H4C) of the herbicide fluridone are once again proposed for use within Lake Sebago.

The first herbicie treatment is proposed to begin in June 2026, pending issuance of all required permits.

Six herbicide treatments are proposed for the 2026 season between June and October.

Shoreline signage will be placed at public access points notifiying of all water use restrictions and removed once restrictions are lifted by NYSDEC.

A single application of a granular formulation of chelated copper (Harpoon) is anticipated to occur in August 2026 to >1 acre of the lake. Product labels are linked below. Both target and non-target species were monitored for impacts throughout the season. There are no water use restrictions for the lake with the use of Harpoon.

Product Labels

Product labels can be found here: https://littlebearenvironmental.com/nys-registered-pesticide-product-labels-special-local-needs-labels/

Water Use Restrictions

An irrigiation restriction will be in place for the entire lake between June 5th until October 2026. Treated water cannot be used to irrigate greenhouse or nursery plants, turf grass, or plants in the nightshade family.

There are no restrictions for fishing, livestock watering, or drinking associated with this project.

There are no swimming restrictions anywhere within the lake in 2026 associated with this project.

There are no restrictions for boating, fishing, or other recreation.

Harriman Group Camps Information Meeting

A virtual meeting will occur in Spring 2026. The meeting will review of 2025 treatment information and proposed plans for 2026. A recording is available here for 2025.

A virtual meeting took place on May 7, 2024. This meeting included a presentation with background on the hydrilla infestation within Lake Sebago and provided details on the success of the 2023 treatment, and was followed by a Q&A session. A recording is available here.

A recording of the 2023 introductory meeting can be found here:
A recording of the meeting is available on YouTube and can be found at this link.