GFM Network News


Herbicide resistance is a growing concern due to glyphosate-resistant kochia (seen here) and the yet small but aggressively spreading waterhemp.

Former weed specialist back on the job

Battling weed resistance will be hard work, says Kim Brown-Livingston

Kim Brown-Livingston says she’s optimistic as she takes the role of provincial weed specialist. “We have a great future,” she said. “We’re going to continue on, and our farmers are doing a really good job of it now.” Brown-Livingston previously held the role of weed specialist from 1998 to 2013 before moving on to work

Kochia's fuzzy leaves makes treating it with a herbicide more of a challenge.

Dry year adds to spray considerations

Manitoba’s weather lately means weeds have toughened up and herbicides may have an uphill battle if weeds aren’t growing vigorously

This year has brought its own quirks to weed control. Kochia is out in force again this year, provincial weed specialist Tammy Jones said. The plants’ fuzzy leaves create their own challenges for herbicide contact, even if the kochia is not showing glyphosate resistance. Glyphosate-resistant kochia has become a significant headache and cause for worry


Kochia seedlings.

Weeds develop defences

Kochia gets hairy and lamb’s quarters get waxy under harsh conditions

Kochia was emerging in Manitoba fields last week and most of it is presumed resistant to Group 2 herbicides, says Manitoba Agriculture weed specialist Tammy Jones. Many could also be glyphosate tolerant, but it’s hard to know to what extent, she said in an interview April 24. “I know that it is distributed fairly thoroughly

Kochia or tumbleweeds can spread across fields by the tumbling action and get caught in fencelines. This is an example of landscape-scale weed spread issues.

It takes a village to stop weeds

Researchers say the community nature of the problem of invasive weeds hasn’t been adequately incorporated into control efforts

Invasive weeds are a problem that defies solution, and only seems to get worse. That’s because they’re a community problem that cross property boundaries, according to weed scientist Muthu Bagavathiannan, of Texas A&M. Finding a real solution will involve recognizing the nature of weeds as a community problem, and managing them accordingly, he and other

Manitoba Agriculture’s 2018 in-season survey now documents 12 municipalities with glyphosate-resistant kochia.

Glyphosate-resistant kochia confirmed in 12 municipalities in 2018

Testing is the only way to confirm how widespread glyphosate-resistant kochia is in Manitoba

When Tammy Jones’ phone rang last year as often as not it was farmers fed up with kochia spreading in their fields. The Manitoba Agriculture weeds specialist dubbed the tumbleweed ‘weed of 2018,’ in a talk at St. Jean Farm Days last week. “We saw a lot of it,” she said. “It felt like anyone


Increasing resistance to chemicals including glyphosate complicates the problem of controlling kochia.

Kochia and salinity: a battle on two fronts

One strategy might be to treat saline patches like a lawn, and mow them before the kochia sets seed


Producers may be looking for a way to beat back kochia, but what does that mean for the salinity problems lurking in the soil? Saline patches were common this year after a second season of below-average moisture. Read more: The year of the tumbleweed “The fluctuations in soil moisture are very linked to the soil

Kochia had good growing conditions this summer and, in some fields, glyphosate is no longer doing the job.

The year of the tumbleweed

Kochia has enjoyed an upswing given Manitoba’s weather this year

It’s a good year to be a kochia plant. That should come as no surprise to growers. The tumbleweed-like plant has become a common sight this year, popping up over crop in what seems like larger and more frequent patches, some of which now show less response to glyphosate. Weather conditions were a large part

Kochia seedlings, part of a U.S. study of the weed, emerge in a field at 
Garden City, Kansas.

Keeping kochia in check

New research indicates the importance of early-season control of herbicide-resistant kochia

Herbicide-resistant kochia is a big problem in the U.S. Great Plains states, and has appeared in limited numbers in Manitoba over the past few years. Now researchers, writing in the latest edition of the journal Weed Science, are beginning to reveal more about how the weed works. Kochia typically begins to emerge in the U.S.


Glyphosate-resistant kochia is the latest warning sign for Manitoba farmers.

Herbicide resistance quietly growing problem in Manitoba

Multi-pronged weed control strategies that go beyond chemicals are urged by researchers

Farmers may lose the war against herbicide-resistant weeds if they don’t start using other forms of control besides chemicals, a University of Manitoba weed scientist says. Herbicide resistance, common in other countries, is starting to appear in Western Canada and it’s just a matter of time before it becomes prevalent here too, Rob Gulden warns.

How to fall apply Avadex and Fortress

Getting the application technique right will make these products more effective

Apply Avadex and Fortress in the fall after the surface soil temperature is below 4 C and within three weeks of soil freeze-up. This situation generally occurs by October 1 across Western Canada. A single heavy harrow pass is sufficient for incorporation in minimum- and zero-till fields. Good soil contact is necessary for these herbicides