GFM Network News


Stem-mining weevils have been successful at stopping the spread of Canada thistle, but the weevils are in short supply.

Supply can’t meet demand for thistle-munching weevils

Stem-mining weevils love Canada thistle but getting enough of the bugs has been a challenge for forage association

Canada thistle is a huge problem in ranchers’ fields — but unfortunately, demand for one of the solutions has outstripped supply. West Central Forage Association has been selling stem-mining weevils since about 2014 but recently its supplier in Montana has had production problems and been unable to fill its orders. “The last couple of years, […] Read more

The stem-mining weevil larvae live up to their name, burrowing down the length of Canada thistles and feeding on their leaves after becoming adults.

There’s a reason why stem-mining weevils are the priciest livestock in Alberta

The insects are mowing down Canada thistle across the province, and attracting lots of eager buyers

Tens of thousands of weevils have been pouring into Alberta from Montana — and producers are clamouring for more. “It’s a biological control and it’s been going great,” said Rachael Nay, conservation agriculture extension co-ordinator with the West-Central Forage Association. The association began the project to import stem-mining weevils four years ago as a way […] Read more