Double crop soybeans start growing half way through the season, so their yield potential is low. Photo: John Greig

Weed resistance closes in on glufosinate

Expanded soybean acres and tighter application windows erode buffers that have protected Liberty herbicide for Prairie farmers

Expanded soybean acres and tighter application windows have eroded buffers that have so far protected Liberty herbicide on Prairie farms

Kochia grows in a low patch of a soybean field north of Ninette, Man., in late August 2025. Photo: Alexis Stockford

Kochia creeps farther north in Manitoba

Farmers are fighting kochia farther north than ever before in Manitoba, while the weed also keeps racking up resistance to herbicides

Farmers are fighting kochia farther north than ever before in Manitoba, while the resistance-prone weed also keeps eating up herbicide options.



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.

Kochia is among the weeds that should be on farmers’ radar this fall.

Early harvest opens options for fall weed control

Spraying tips to use once the combine is parked

[UPDATED: Oct. 11, 2023] An early harvest gives farmers the opportunity to get ahead of weeds for next season, says Manitoba Agriculture weed specialist Kim Brown. Weeds have had ample time to grow after harvest, making them prime targets for herbicide. Why it matters: As harvest winds down, attention turns to field preparation for 2024.


Quick adapting and designed to spread, kochia seems biologically primed to pick off the punches farmers throw at it.

On the ropes against kochia

Growers face a formidable foe. Fast mutations and efficient seed spread are a tough one-two combination

Kill it with fire. That was the gist in 2018, after a photo of post-spray kochia in Saskatchewan made the rounds on social media. The image showed a swath of dead, brown plants. That made the single, green plant right in the centre stand out even more. There was a collective recoil from farmers in

Field patches where kochia is dominant are candidates for mowing or, in the case of herbicide resistant plants, hand-weeding before it sets seed.

Strike early when fighting kochia in canola

Kochia has few means of control, so know the options

Glacier FarmMedia – Kochia is one of the fastest-spreading and most resistant weeds common in canola. The key is to control it before it sets seed, experts say, and that means striking when it’s small. Herbicide resistant kochia has been a management headache for growers across the Prairies. Pre-seed burnoff is the first tool in


“You need to make every drop of the herbicides count while they’re still working.” – Kim Brown-Livingston.

Herbicide resistance can’t be ignored

A weed control strategy will encompass the entire production system

Herbicide resistant weeds have been present in Manitoba since the 1980s but they are now becoming a critical issue that cannot be ignored. Kim Brown-Livingston, Manitoba Agriculture’s weed specialist, called it the biggest problem facing producers. More resistance is cropping up and no new modes of action have been available on the Prairies in the

Students bring KAP resolution on kochia

Students bring KAP resolution on kochia

Perennial forages can help stamp out weeds, but lost revenue needs to be offset, ag students say

A group of agriculture students say farmers should be incentivized to combat herbicide-resistant kochia by growing perennial forages. The weed is spreading faster than ever in Manitoba, and something must be done “before we have to return to historic practices of hand-picking weeds,” University of Manitoba student Richard Davy told Keystone Agricultural Producers members on