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

Reading Time: 2 minutes 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

Reading Time: 2 minutes 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