On September 3, the Glen Lake Association identified two fragments of Eurasian watermilfoil (“EWM” or Myriophyllum spicatum L.) on watercraft trailers exiting Little Glen Lake. This occurred at the DNR boat launch on Day Forest Road. Although this is unwelcome news, we are thankful for the dedication of our boat wash staff whose diligence led to early detection of the plant.
EWM is a highly invasive aquatic plant species that is widespread throughout Michigan. It has been found in other nearby inland lakes, including Lake Leelanau and Crystal Lake. If left unchecked, EWM can grow quickly and spread. It tends to form thick mats that block sunlight, threatening the diversity and abundance of native plants. This is problematic because fish and other underwater animal species rely upon native plants for food and shelter. EWM can also have an adverse effect on recreational lake activities.
Last week, the GLA Board approved a strategic plan to respond immediately to this situation. We have retained an expert in drone technology to map and survey the entirety of Little Glen, along with a small portion of Big Glen just east of the M22 bridge. This will take place as soon as possible, weather permitting. Following the survey, a GLA team led by Watershed Biologist Rob Karner will review and analyze the resulting high-resolution video footage to identify the exact location of possible EWM colonies. If necessary, the GLA will develop an eradication strategy over the winter months which will be implemented during the 2024 EWM growing season.
In the meantime, we encourage everyone to report any sightings of EWM immediately to the GLA. Read more about EWM, including what it looks like and how to identify it. This short video is also a helpful resource.
We strongly advise riparians NOT to attempt removal by hand pulling, raking, or use of chemicals. It is unlawful to apply chemicals in the water without an EGLE permit, and improper removal efforts may inadvertently spread the plant.
We will continue to keep you apprised of this situation through future e-blasts. In the meantime, please feel free to contact the GLA with any questions or concerns.