Herbicide-resistant wild oats growing among the establishing TruFlex canola plants on the Dions’ 600-acre field at Donnelly, Alta. Photo: Supplied

Farm gets aggressive on wall-to-wall resistant wild oats

Agronomist says managing herbicide-resistant weeds is like starting a fitness routine: make a plan, set goals, stick with it

Beating herbicide-resistant weed populations means making a plan with clear goals and objectives and staying on top of it — and that means not allowing weeds any opportunity to set seed in big numbers.

wild oats and green foxtail

Rethinking weed management

Not every weapon against herbicide resistance comes out of a sprayer

Farmers up against herbicide-resistant weeds need to rethink their cropping systems and add more angles in their approach to long-term weed control. This advice came from Dr. Drew Lyon of Washington State University during his presentation at the Manitoba Agronomists’ Conference in December. While Lyon’s discussion primarily focused on integrated weed management (IWM) in dryland […] Read more


wild oats

Maul of the wild

Farmers who missed two-decade-old advice on wild oat management now face the fallout, but new research and technology might still turn the tide

Any Prairie farmers who ignored a 2005 paper on managing herbicide-resistant wild oats, back when it first dropped, might feel like they’re getting an “I told you so” finger wag if they were to read it today. Authored by Hugh Beckie, a former AAFC researcher known for his contributions to weed management and herbicide resistance […] Read more

Ryan Ruchkall uses a drone to collect field data on kochia and wild oat at EMILI’s Innovation Farms. EMILI is working with Geco Engineering to assess the performance of Geco’s weed mapping technology for predicting weed locations and detecting emerging herbicide resistance.

Integrated weed management faces new future

Intercropping, predictive weed control could redraw battle lines in the fight against herbicide-resistant weeds

Glacier FarmMedia — Herbicide resistance in weeds is rising and there are no new chemistries on the horizon, so farmers will need fresh approaches to integrated weed management strategies. “I think the best management practice that someone could do for weed resistance is the one you’re not currently doing on your farm,” says Rory Cranston, […] Read more


AAFC’s Breanne Tidemann says kochia (seen here) appears to be spreading to areas of Alberta where it wasn’t seen previously.

Into the weeds: 2024 in preview

Prairie specialists consider which weeds are most likely to succeed as the season proceeds

The past few seasons have been a challenging time for farmers on the Canadian Prairies. Extreme heat, lack of precipitation and steep increases in production costs have caused some sleepless nights for many producers. As if those weren’t enough to contend with, another potential threat to crops will soon rear its ugly head: weeds. Grainews […] Read more

Planting perennial forages in ditches is recommended to help keep kochia from getting a toehold.

Weed alerts on the southern front

A North Dakota weed expert cautions Prairie farmers about kochia, waterhemp and Palmer amaranth and their evolving herbicide tolerances

Of all the things shared by Prairie farmers on both sides of the Canada-U.S. border, an abiding love of their land, fretting over the weather and a no-nonsense, ‘get ‘er done’ attitude are among those that come to mind. Unfortunately, this also includes weed problems. Weeds know no borders, of course, so when weed trouble […] Read more


As part of a series of weed abundance surveys, 2,277 fields across Saskatchewan were surveyed in 2019 and 2021. That data was used to provide metrics such as the frequency and density with which weed species can occur in a region after post-emergence herbicide application.

Herbicide-resistant weed update for Saskatchewan

Your biggest herbicide-resistant weed threats for 2023 based on the latest survey results

As any farmer will attest to, herbicide-resistant weeds are a growing concern on the Canadian Prairies. In fact, it’s estimated they cost farmers in Western Canada as much as $530 million annually in lost yields and alternative weed management practices. Charles Geddes, a research scientist with Agriculture and Agri-Food Canada (AAFC), who specializes in weed […] Read more



A herbicide layering strategy uses a pre-seed treatment on emerged weeds while using soil-applied products simultaneously to control weeds that emerge a couple of weeks after the initial application. The pre-seed treatment helps to remove early-emerged weed pressure while the soil-applied application, when activated by moisture, provides extended control to help reduce weed pressure prior to the application of an in-crop herbicide. This type of strategy not only helps with early weed removal and allowing the crop to establish and take advantage of the nutrients and moisture available, but it also provides farmers more options for an in-crop application that will best target the later-emerging weeds that have to be dealt with.

Take a layered approach to herbicides

Develop an effective herbicide layering strategy — it could be one of your most powerful tools in the fight against herbicide resistance

It’s no secret that herbicide-resistant weeds are making life increasingly difficult for many crop growers in Western Canada, but the situation is far from hopeless, says an agricultural expert. Canada currently ranks third in the world for herbicide-resistant weeds, trailing only the United States and Australia in that category. Studies have shown there are currently […] Read more

Kochia isn’t fussy about where it grows and can flourish in almost any conditions.

Keep kochia off your farm

Why kochia is one of Western Canada’s most problematic weeds, plus how to knock herbicide resistance on the head or prevent its development in the first place

Prairie farmers are well known for their hospitality but there’s one visitor they want nothing to do with — kochia. Kochia has become one of the most problematic weeds in Western Canada. A single kochia plant can produce up to 25,000 seeds and can achieve a germination rate of 60 per cent or higher depending […] Read more