Exotic plants typically are the greatest threat to the ecological integrity of a lake ecosystem and should be controlled. Growth of native plants should be promoted and allowed to recover from the invasion of exotic plants.
With these objectives in mind, in the spring of 2012 Professional Lake Management (PLM) will treat the entire lake using SONAR (fluridone), which has been approved for use by the Michigan Department of Environmental Quality (MDEQ). Treatments will be in mid April and early May. The initial treatment is done when the lake water temperature has stratified, and is applied at a concentration of six parts per billion (6ppb). Water samples are taken and analyzed to determine if the concentration level stays at 6ppb. If the concentration drops below that level a second treatment is done to restore the concentration to 6ppb. Because SONAR is slow-acting (control is usually achieved over a 45 to 60 day period), the concentration level must be maintained at 6ppb for as long as possible. Use of other herbicides is not permitted by the MDEQ in the year SONAR is applied. Water testing will be conducted throughout the 2012 lake season.
For years 2013 through 2016 conventional spot treatments to control any surviving eurasion milfoil will be conducted using other approved herbicides. Herbicides such as Navigate (2, 4-d), Renovate (trichlopyr) and Reward (diquat) have proven to be effective in controlling eurasion milfoil without harming native plants. Herbicide selection will be determined based upon site conditions (location, water depth, plant density and possibly other factors). Monitoring will be conducted five or six times each season.
Algae blooms will also be treated as needed using non-restrictive products such as copper sulfate and/or chelated copper products.
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