A swathed cereal crop is combined in west-central Manitoba Aug. 30. Photo: Alexis Stockford

Herbicide resistance thriving in Manitoba wild oats

Farmers’ weed battle with wild oats isn’t getting any easier, with growing herbicide resistance increasing risk that spraying won’t beat it back

Farmers’ weed battle with wild oats isn’t getting any easier, with growing herbicide resistance increasing risk that spraying won’t beat it back.

A patch of stinkweed flourishes in a field in the RM of Cartier in Manitoba on May 21, 2025.

VIDEO: What’s that weed seedling?

Identifying weeds while they’re still small and easier to control can save the farmer from big weed problems later in the season

Identifying weeds while they’re still small and easier to control can save the farmer from big weed problems later in the season



A new generation of herbicide tolerant soybeans is coming soon, according to Bayer.

New Bayer genetics to open up soybean herbicide tolerance

Vyconic trait set offers tolerance to five herbicides and will be integrated with the company’s soybean varieties in coming years

Bayer’s Vyconic soybeans offer tolerance to five herbicides, a first for Canadian crop growers. This new advancement could help farmers combat resistant weeds and manage fields.


Left to right: Weed specialists Jeanette Gaultier of BASF, Kim Brown of Manitoba Agriculture and Tammy Jones of Corteva participate in a panel at this year’s Manitoba Agronomists Conference, moderated by plant science professor Rob Gulden.

Building a culture of weed control

Experts highlight importance of collaboration between government and private sector agronomists to contain problem weeds

Collaboration between government and private sector agronomists to contain problem weeds and herbicide resistance is key, Manitoba Agronomists Conference panel says.

VIDEO: Weeds to watch for in Manitoba

VIDEO: Weeds to watch for in Manitoba

Crop spraying conditions have likely improved since this was recorded at Crop Diagnostic School earlier this month, but that doesn’t mean any weed issues you may have been dealing with are in the rear-view mirror. As provincial weed specialist Kim Brown puts it, the warm-season weeds are upon us and taking full advantage of the


Photo: Getty Images

Bayer looks to AI to combat herbicide resistance faster

Bayer's Icafolin will be its first new mode of action herbicide in some 30 years when it launches in 2028

Weeds are growing resistant to the herbicides already on the market, and agribusiness companies like Bayer are in a desperate search for new modes of action to help farmers kill them.

VIDEO: Taking the fight to kochia in North Dakota

VIDEO: Taking the fight to kochia in North Dakota

There are a number of problem weeds that growers often contend with each season, but kochia is one weed problem in particular that’s of growing concern – and not only here on the Prairies, but also south of the border. Jason Hanson, a crop consultant in North Dakota, travelled to St. Jean Farm Days earlier


Kochia in a canola field.  Photo: File

Crop-killing weeds advance across US farmland as chemicals lose effectiveness

Losing battle with weeds adds pressures to farmers already stressed by inflation, extreme weather

Crop-killing weeds such as kochia are advancing across the U.S. northern plains and Midwest, in the latest sign that weeds are developing resistance to chemicals faster than companies including Bayer BAYGn.DE and Corteva CTVA.N can develop new ones to fight them.

File photo of palmer amaranth — the taller yellowish plants — infesting a U.S. cotton field. (Photo courtesy ARS/USDA)

Palmer amaranth pops back up in Ontario

Weed infamous in U.S. for multiple herbicide resistances

A single plant that showed up this summer on the edge of a southwestern Ontario cornfield is cause for concern among Canadian farmers, weed specialists warn. Writing Monday in the ag ministry’s Field Crop News, Ontario provincial weed management specialist Mike Cowbrough said the plant in question, found in Wellington County, is confirmed as palmer