Following three EWM monitoring and manual rake removal surveys in 2018 that documented a significant uptick in EWM in the northeast bay, the ELA, under the direction of Lake Education and Planning Services, Inc. (LEAPS), decided to treat 3.84 acres with granular 2, 4-D (Shredder Amine 4) with a target concentration of 4ppm on June 2, 2019. Posttreatment, we were asked to complete two lakewide EWM monitoring and manual rake removal surveys over the summer and a third survey in the fall if we found a significant number of plants. This report is the summary analysis of our surveys on the lake in 2019. These data will also be used to determine if and where EWM control might be considered in 2020.

This report is the summary analysis of our three field surveys to locate and remove EWM on the lake in 2017. These data will also be used to determine where EWM control might be considered in 2018.

Following 13 years of active management that included herbicide treatments covering a total of 62.43 acres, EWM was reduced from 106 points with a mean rake fullness of 1.28 in August 2007, to one point in July 2012, to no points in July 2017. Continuing to aggressively manage EWM to limit its spread while simultaneously working to minimize its impact on Echo Lake’s native plants and keeping economic costs low; and proactively working to limit nutrient inputs around the lake which can fuel both algal as well as milfoil growth are management priorities for the ELA to consider as they update their management plan.

Data corresponding to Curly-leaf pondweed (Potamogeton crispus) Point-intercept and Bed Mapping Surveys, and Warm-water Macrophyte Point-intercept Survey document.

Data corresponding to Curly-leaf pondweed (Potamogeton crispus) Point-intercept and Bed Mapping Surveys, and Warm-water Macrophyte Point-intercept Survey document.

Grant AEPP50117 awarded