There was a planned herbicide treatment for Bone Lake in spring 2018. The pretreatment survey was conducted and all beds were delineated and permitted. However, the late spring made timing difficult. There was never a day that occurred within the water temperature guidelines that met required conditions. As a result, it was decided to cease treatment.

AIS report for Bone Lake regarding the treatment of Potamogeton crispus.

Herbicide treatment analysis for CLP in Bone Lake, Polk Co. in 2017

The herbicide endothall was applied to reduce Potamogeton crispus-curly leaf pondweed (CLP) on May 20 and June 4, 2015 in Bone Lake, Polk County Wisconsin. There were seven treatment beds totaling 30.15 acres in area. A pretreatment survey was conducted on April 19 and a post treatment survey was conducted on June 12 and 16 to evaluate the effectiveness. The surveys showed that the treatment resulted in a statistically significant reduction in CLP frequency comparing before treatment frequency to after treatment frequency (71.1% before treatment to 11.8% after treatment). A comparison between the 2014 post treatment survey and the 2015 post treatment survey showed a small increase in CLP frequency. Comparing the 2014 pretreatment survey to the 2015 pretreatment survey showed a small decrease that was not statistically significant. A native plant species evaluation revealed a statistically significant reduction in one species, Ceratophyllum demersum-coontail. A turion analysis conducted on Oct. 17, 2015 showed a decrease in the turion density in all beds from 2014 to 2015. The turion density remains high in two of the treatment beds. The remaining CLP that was dense and near the surface in Bone Lake was mapped on June 15 and 16. There was 49.5 acres of dense CLP remaining in 2015.

Grant ACEI-171-15 awarded