2021 CLP Herbicide Analysis

The Lake District has received a copy of the 2021 Curly Leaf Pondweed Herbicide analysis from our partner ecological service. Please see below for a summary and link to the full PDF.

Abridged Analysis Summary:

On April 30, 2021 two beds totaling 4.95 acres of Potamogeton crispus-curly leaf pondweed (CLP) were treated with the herbicide endothall at a target concentration of 2.5 ppm. A pretreatment survey was conducted earlier in April, and a post treatment survey was conducted in June 2021. The frequency of occurrence from the pretreatment to the post treatment survey showed a statistically significant frequency of occurrence reduction (from 75% to 35.7%) (p=0.0025).

A chi-square analysis revealed a statistically significant reduction in two native plant species; Elodea canadensis (waterweed) and Najas guadulupensis (southern naiad). A turion analysis resulted in a slight increase in turion density from 2020 to 2021 (4.3 to 6.9 turions/m2). With the 2021 turion density data included, there has been a slight decrease trend in turion density since 2012.

Ecological Integrity Service, LLC

Amery, WI 54001