Reading Time: < 1 minute The West-Central Forage Association won’t be bringing in Canada thistle stem-gall flies this year. The flies lay their eggs on the tips of thistle shoots in the early summer, with the larvae burrowing into the shoots and triggering gall formation, which stresses the plant by stealing nutrients. The association said it is discontinuing the program […] Read more
Thistle control program on hold
Vietnam could halt imports of wheat containing thistle seed
Hanoi | Reuters — Vietnam might halt imports of wheat cargoes containing cirsium arvense, or thistle seed, while suggesting local importers should seek supplies from Kazakhstan, Australia and Argentina, local media reported on Thursday. Wheat importer Vietnam, whose main suppliers include Russia, Australia and Canada, has been battling with imported wheat contaminated with thistle seed […] Read more
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
Perennial sow thistle costs farmers across Alberta
Noxious Weeds: Perennial sow thistle causes yield loss and acts as a host for pests
Reading Time: 2 minutes Often found in high densities across Alberta, perennial sow thistle seems to be a noxious weed that doesn’t quit. Not only does this pest cause significant yield loss in many crops, but it’s a host for several plant pests that attack economically important crops such as alfalfa, winter wheat and canola — just to name […] Read more
This quick-spreading weed gets an early start
Noxious weeds: Canada thistle
Reading Time: < 1 minute Spring brings lovely native flowers, but also noxious weeds. The aggressive perennial Canada thistle is a favourite of disturbed soils of all types. It starts sending shoots from horizontal roots to the surface of soil around mid-April, with flowers to follow in mid-June and continuing throughout the summer. Easy to distinguish from other weeds, this […] Read more
Canada thistle: Meet your worst nightmare
Every rancher hates this hard-to-control weed, but stem mining weevils just eat them up (from the inside)
Reading Time: 3 minutes Every year, Canada thistle takes a big bite out of the productivity of Alberta forage and grasslands. But an increasing number of producers is biting back — in a wholly natural way. In late August, the West-Central Forage Association will once again import hundreds of cartons of little black bugs from an insectary in Montana. […] Read more
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