Impact of Stem Mining Weevil (Hadropontus litura) population density on Canada Thistle Suppression

Canada thistle (Cirsium arvense) is an aggressive, colony-forming perennial weed which reproduces by both seeds and horizontal creeping root systems.

It is listed under the Alberta Weed Control Act as noxious. Canada thistle has a high tolerance to many environmental conditions and is very competitive with other types of vegetation. It is common in locations like riparian areas that do not allow for chemical or mechanical weed control.

There is hope, however. Enter: the stem-mining weevil.