Submersed-herbivore
Guides
Euhrychiopsis lecontei
Milfoil Weevil
A small submersed aquatic weevil native to North America, investigated as a biological control agent for invasive Eurasian watermilfoil. Adults and larvae feed on watermilfoil species, with larvae acting as stem borers that damage plant tissue. Populations occur naturally on native northern watermilfoil and have expanded to exotic Eurasian watermilfoil. The species exhibits plastic host preferences influenced by rearing experience, with faster development and larger adult sizes observed on Eurasian watermilfoil despite higher larval survivorship on native hosts.