Weed Treatment

Note: Update as of 2/8/19

Thank you to all who voted for the weed treatment proposal. The results are in and we WILL BE MOVING FORWARD with the treatment! 

For More Information:


To initiate a lake management plan proposed by Solitude Lake Management and discussed at the 2018 annual meeting starting with a treatment utilizing Sonar (fluoridone) herbicide to treat the nuisance weeds found in the lake. The product, Sonar (fluoridone), is a systemic herbicide that works by maintaining a concentration throughout the season achieved by multiple applications, which would need to start at the beginning of the growing season in May 2019.

View Solitude’s Notice of Intent Filing draft here: man_bungaylk18_notice of intent_draft

Is it Safe?

  • There are no label restrictions on recreational activities such as swimming, boating or fishing.
  • It is customary to close the water body during the day of treatment per Solitude company protocol.
  • Sonar is approved for use in drinking water, so it is not harmful to pets or fish.
  • This product is approved for aquatics use by the EPA, as well as the State of Massachusetts, undergone a strict review and has been in use for decades.

The only restriction to note regarding Sonar is an irrigation restriction (meaning if residents are actively drawing water out of Bungay Lake to water their lawn or gardens, this would be restricted while the product has an active concentration in the water).

View Sonar A/S MSDS sheet here.


  • The cost of this project is $54,169 to treat all nuisance areas identified in the lake, see map below.
  • If we target only the higher vegetation areas, all identified areas on the map except the green area, the cost is $39,975.
  • The association can contribute $22,000 from the dues & “FUN”raisers collected over the past several years in preparation for weed control with the members authorization.

To conduct the treatment Bungay Lake Associates Inc. would need to raise the additional dollars, $18K – $33K, prior to May to complete the project if these funds are not raised the project will not be able to move forward and would have to wait until 2020.

How Long Does it Work For?

  • The proposed Sonar treatment should be thought of as almost a “reset.” It will achieve great control of the target invasive species, but eradication is impossible.
  • Solitude recommends this “Sonar reset” to get the system under control and an annual management program after the 2019 season to “maintain desirable conditions.”
  • The ongoing management of regrowth of the target invasive species (fanwort and milfoil) can be conducted at a significantly lower cost, approximately $12,500 per year starting in 2020.
  • Typically, you will expect two to three years of nuisance level control of the fanwort and two years of nuisance level control of the milfoil. Unfortunately, tape grass is affected less and will be diminished during the year of treatment and will bounce back in subsequent years, you could potentially see some benefit in the tape grass control in the year after the treatment.

Tape grass is likely helping limit fanwort and milfoil growth in some of the areas on the eastern and western shorelines and will have to managed in a separate plan not included in this scope/cost.


2 thoughts on “Weed Treatment

    • The weed treatment has been tentatively scheduled for June 8th! Solitude will be posting on the day of treatment and sending emails to those residents on the contact list.

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