Abstract

We examined the response of Eurasian watermilfoil (Myriophyllum spicatum) coverage on Manistee Lake, Michigan (U.S.A.) in the presence of milfoil weevils (Euhrychiopsis lecontei). Among 150 sites, milfoil presence declined from 2008 levels of 34 (23%) sites to 2 (1%) sites by 2015 coincident with cumulative stocking of 259,500 weevils from 2007 to 2014. Severe winter temperatures also were associated with milfoil declines. Each 1°C decline in average low temperature during the preceding winter was associated with 3.4 (95% CI 0.8–6.1) fewer sites with milfoil. Impacts of weevil herbivory on watermilfoil may be accentuated by severe winter temperatures. Lake managers should, when possible, integrate weather conditions with weevil stocking regimes to control Eurasian watermilfoil.

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