To address invasive species, the Lake Quinsigamond Commission – which is made up of representatives of Worcester, Grafton and Shrewsbury – continues efforts on a long-term comprehensive aquatic vegetation management plan. The plan includes the drawdown, harvesting, and herbicide control of vegetation, as well as public outreach to prevent new species from entering the lake.
RESOURCES
TOXIC ACTION CENTER
- Non-toxic Lake Management Safer response to invasives
- Chemical-Free Lakes: A Resource Guide to New Hampshires Invasive Aquatic Plants and Non-Toxic Treatment Alternatives (2012)
- Clear As A Lake: A Resource Guide to Invasive Aquatic Plants and Non-Toxic Treatment Alternatives (2008)
FLUORIDE ACTION NETWORK – Fluridone lake herbicide town battles
TOXIC-FREE FUTURE: Problems with Aquatic Pesticides
Clipper Pesticide (51% Flumioxazin) – Safety Data Sheet
Sonar Pesticide (41.7% Fluridone) – Safety Data Sheet
Diquat dibromide
LOCAL NEWS
08/23/18 – Lake Quinsigamond to be chemically treated for nuisance aquatic vegetation
02/20/18 – Worcester gets clearer picture of health of its lakes
LAKE SPRAYING IN THE NEWS
11/08/18 – Congrats To The Lake Iroquois Activists!
10/15/18 – State agency denies request for use of herbicide in Lake Iroquois
10/12/18 – Vermont Watershed Protected from Hazardous Pesticide Use
07/30/18 – California says this chemical causes cancer. So why is it being sprayed into drinking water?
05/04/17 – CITIZENS CONCERNED ABOUT HERBICIDE USE ON LAKE IROQUOIS VOICE CONCERNS REGARDING TOXICS & PROCESS
04/28/17 – Hinesburg residents at odds over milfoil on Lake Iroquois
LOCAL VIDEOS
The Lake Show – 05 Invasive Weeds Lake Quinsigamond
VIDEOS
Two people who care deeply about Lake Iroquois have very different views on how to deal with the lake’s milfoil problem, one opposing the use of an herbicide and the other saying it’s one of their best options.

Lake Iroquois is the center of a controversy: how to control its invasive species population.
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