[1] It is found in the eastern and central United States and western Canada.
[2] E. lecontei is a holometabolous insect, undergoing true metamorphosis.
Milfoil weevils occur in natural populations in much of North America on their native host, Northern watermilfoil (Myriophyllum sibiricum).
They often reach sufficient densities to suppress invasive Eurasian watermilfoil (Myriophyllum spicatum) infestations after a prolonged infestation or artificial augmentation.
[3] There are mixed reviews that fish such as bluegills can reduce weevil populations as research has only been conducted in very limited settings.