GFM Network News


Glyphosate-resistant kochia is still rare in Manitoba, but the time to prevent it from spreading is now.

ON THE GROW: Herbicide resistance is spreading quickly

Manitoba Agriculture is warning about new and looming threats when it comes to resistant weeds

Manitoba’s provincial weed specialist is urging a harder line on herbicide resistance. “Zero tolerance is really where you need to be,” Tammy Jones of Manitoba Agriculture said. “Controlling your escapes. Control them with mowing; control them with tillage. If you really want to, control them with hand weeding, but if you have resistant wild oats

Agronomist Peter Johnson doesn’t like Manitoba’s tight rotations.

Tight crop rotations in the hot seat

Rotations were a major point as discussions turned to blackleg during this year’s BASF Knowledge Harvest

It’s all but impossible to eliminate sclerotinia and blackleg from the field, but it’s also a mistake to assume crop genetics alone will manage the problem. BASF technical service specialist Colleen Redlick said farmers need to broaden their approach during the BASF Knowledge Harvest in Brandon earlier this winter. Resistance breakdown, something the industry has


AAFC’s Bob Blackshaw talks herbicide-resistance problems and solutions at Brandon’s BASF Knowledge Harvest Feb. 13.

Manage herbicide resistance in the tank and out

Industry is pushing both chemical and non-chemical solutions to growing herbicide-resistance problems in Manitoba

It’s time to expand the tool box when it comes to managing weeds. That was the message to attendees at this year’s BASF Knowledge Harvest in Brandon Feb. 13. As of 2015, there were 65 unique weed-resistance cases in Canada, AAFC’s Bob Blackshaw said, a number that rose from near negligible in 1975 and sat

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.

VIDEO: Fighting herbicide resistance in weeds

VIDEO: Fighting herbicide resistance in weeds

Provide a healthy, competitive crop stand to help battle back weed pressures

“If you don’t put a crop plant there on that spot in the field, a weed’s gonna grow,” says Rob Gulden, professor of weed science at the University of Manitoba. Gulden was referring to one strategy producers can use to help fight herbicide-resistant weeds, and that is by increasing their seeding rates. In this interview with


Herbicide-resistant Palmer amaranth can devastate crop yields.

Palmer amaranth resistance more complex

Two new mechanisms for herbicide resistance 
have been found in Palmer amaranth

Scientists are continuing to discover just what a difficult foe the weed Palmer amaranth can be. It can cause yield losses as high as 80 per cent for soybean growers and has already developed resistance to six classes of herbicide since its discovery in North America 100 years ago. It’s recently been found in North

Palmer amaranth. (United Soybean Board photo)

Minnesota probes Palmer amaranth’s sudden appearance

Chicago | Reuters — Minnesota has launched an investigation to find the source of seed mixes contaminated with weed seeds after the aggressive, herbicide-resistant Palmer amaranth weed was found on 30 areas planted in a federal conservation program. The weed grows very fast, reaching up to eight feet in height and can hold back commercial

Photo: File

EPA approves Monsanto’s dicamba weed killer

U.S. seeds and agrochemicals maker Monsanto Co. has secured approval from the U.S. Environmental Protection Agency for a new dicamba-based weed killer designed for its next generation biotech soy and cotton varieties, the company said on Wednesday. While approval had been expected, it is seen as a major step forward for the company’s newest herbicide


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.

Four steps to managing herbicides

Four steps to managing herbicides

Cutting herbicide resistance risks comes down to managing herbicides, in part. Here are four tips for doing that better, courtesy of Kate Sanford Mitchell, who manages Bayer CropScience’s herbicide and insecticide portfolios for oilseeds.