Divergent responses of cryptic invasive watermilfoil to treatment with auxinic herbicides in a large Michigan lake
-
Published source details
Parks S.R., McNair J.N., Hausler P., Tyning P. & Thum R.A. (2016) Divergent responses of cryptic invasive watermilfoil to treatment with auxinic herbicides in a large Michigan lake. Lake and Reservoir Management, 32, 366-372.
Published source details Parks S.R., McNair J.N., Hausler P., Tyning P. & Thum R.A. (2016) Divergent responses of cryptic invasive watermilfoil to treatment with auxinic herbicides in a large Michigan lake. Lake and Reservoir Management, 32, 366-372.
Summary
Action: Use herbicide to control problematic plants
A before-and-after study in 2014 in a lake in Michigan, USA (Parks et al. 2016) reported that native northern watermilfoil Myriophyllum sibiricum was present before, but not after, a focal herbicide application. survey points (frequency: 0.2%) before herbicide application, but was not found at any survey point three months after (frequency: 0%). Statistical significance of this change was not assessed. Meanwhile there was a significant decline in the frequency of non-native Eurasian watermilfoil Myriophyllum spicatum (before: 2%; after: 0%) and hybrid watermilfoil M. sibiricum x spicatum (before: 21%; after: 16%). The same was true for abundance at each survey point (data reported as an abundance score). Methods: In June 2014, herbicides were added to 428 ha (5%) of Houghton Lake: 339 ha of 2,4-D-amine (29 kg/ha) and 89 ha of triclopyr (15 kg/ha). The lake had been treated with herbicide intermittently since 2002. Watermilfoils were surveyed with a rake before (June 2014) and after (September 2014) the focal herbicide application, at 996 points across the lake (including some in areas not directly treated with herbicide).
)_2023.JPG)
