Weevils - Herbicide Alternative

If you're looking for an option to control Canada thistle besides using herbicides, hand picking or mowing, this biological control agent may be right for you. The Canada thistle Stem Mining Weevil (Hadroplontus litura) was introduced from Europe to Canada in 1965 and to the USA in the early 1970's to feed on Canada thistle. The weevil restricts its feeding to this weed and a few close relatives. Weevil feeding may allow a variety of other micro-organisms to enter the thistle stem, with adverse consequences for the thistle: field studies in Montana indicated that underground parts of stems are much more subject to winter kill if the aboveground stem is attacked by weevils during the growing season.

West Central Forage Association has been working with local producers on the release of these weevils for years. Sites where weevils have been released have generally shown decreased stand vigour and patches thin out over time. In 2012, 50 dishes (each containing 105 weevils) were brought up from Montana for producers in the West Central Region who were interested in the purchase and release them in thistle patches. Added to this were 58 dishes for a regional trial set up by the Agricultural Research and Extension Council of Alberta. Yellowhead County releases these weevils as well along the edges of rivers, lakes and streams in or near Right of Ways where herbicide application is prohibited.

Weevil Information Sheet

Weevil Summary Sheet with Before & After Images

If you are interested in purchasing some Weevils please contact:
West Central Forage Association
1-780-727-4447
conservationag@westcentralforage.com
P.O. Box 360
Evansburg, AB
T0E 0T0

 

County Offices

EDSON OFFICE (MAIN)

2716 - 1 Avenue,Edson,AB. T7E 1N9
Phone: 780-723-4800
Toll Free: 1-800-665-6030
Fax: 780-723-5066

WILDWOOD OFFICE

53404 Rge Rd 92A,Wildwood,AB.
Phone: 780-325-3782
Toll Free 1-800-814-3935
Fax: 780-325-3783

Latest News

County Maps

countymaps