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Tag Archives herbicide resistance — page 3

“There are waterhemp populations, mostly in the States, that are resistant to nine different herbicide groups. At that point, you have no options left.” – Kim Brown Livingston.
Crops, News

The end of the chemical era draws near for farms

The future of weed control is going to require a more balanced approach

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Chemical herbicides have long been the jewel in the crown of weed management, but after seven decades of use, natural selection is turning back the calendar. Herbicide resistance in weeds was first discovered in the 1980s and the problem has steadily increased. With no new chemistries introduced in more than 30 years, it’s clear that
A new research chair aims to give Manitoba farmers new and better tools to fight weeds in their fields.
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New research chair aimed at weeds

Farmers’ dollars help kick start new research chair position at U of M

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A new University of Manitoba research chair is taking the fight against weeds to the next level. The Manitoba Crop Protection Chair in Weed Management is dedicated to research that will support integrated weed management strategies. In late September, the university announced the appointment of Dilshan Benaragama to the new role. “This is a great
Wild oat a growing resistance challenge
Crops, News

Wild oat a growing resistance challenge

Keep an eye on your fields this summer and be ready to tackle the problem when you see it

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If you rely solely on crop protection products to fend off wild oats, you’re not going to like the eventual bottom line. Herbicide-resistant strains of the weed are going to mean you’ll eventually run out of luck. It’s not a new problem, but every year it gets just a little bit more concerning. “Resistance is
It’s assumed almost all kochia in Manitoba is already resistant to Group 2 herbicides.
Crops, News

Herbicide resistance keeps on rising

Mother Nature keeps outsmarting the available crop protection products

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Every year weed scientists with Agriculture and Agri-Food Canada continue their herbicide-resistant weed surveys — and every year they find new places with weeds poking through the crop canopies in direct defiance of the spraying. This is because Mother Nature is better at genetics than we are at chemistry so our herbicides just can’t keep
Herbicide resistance is a growing concern due to glyphosate-resistant kochia (seen here) and the yet small but aggressively spreading waterhemp.
News

Former weed specialist back on the job

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

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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
In this photo from Mike Cowbrough’s October 2019 Pest Patrol column in Country Guide, light-green waterhemp plants approach the top of a soybean canopy after two ineffective applications of glyphosate. (Supplied photo)
Crops

Group 27 herbicide resistance arrives in Canada

Mesotrione-resistant waterhemp confirmed in Quebec

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A persistent and fiercely competitive weed that has developed resistance to several herbicide groups since its arrival in Canada is now the first in the country to fight off a Group 27 product. Quebec’s Reseau d’avertissement phytosanitaire (RAP) last Friday reported a patch of waterhemp with resistance to mesotrione herbicide in the Haut-Richelieu municipality, in
Herbicide-resistant wild oats are still controlled by glyphosate — for now.
Crops

Now’s the time to find resistant weeds

Herbicide-resistant weeds are on the rise and pre-harvest is a good time to find them

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Delaying the onset of herbicide-resistant weeds isn’t a lost cause. In fact the more vigilant a farmer is the more success they’ll have, says Ingrid Kristjanson, a farm production extension specialist with Manitoba Agriculture and Resource Development (MARD). With farmers checking crop maturity as harvest grows near, it is also a good time to scout
Provincial weed specialist Tammy Jones says leaving small patches of survivors can quickly result in a huge problem as new and highly competitive herbicide-resistant weeds have arrived.
Crops, News

Losing the war on weeds

Tammy Jones has been doing the math on where herbicide resistance is taking Manitoba farmers and the numbers are grim

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Tammy Jones spent four hours last summer wrestling with about 300 waterhemp plants in a Manitoba field, yanking them out of the ground by the roots and carrying them to the field edge for destruction. The provincial weed specialist was trying to demonstrate the value of controlling what might seem to be small patches of
The researchers started with a single seed of Amaranthus hypochondriacus, their test plant, and grew generations of the plant to produce the seeds they needed for their experiments.
Did you know?, News

New mutations for herbicide resistance rare

Most resistance seems to come from pre-existing genetic conditions

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After exposing more than 70 million seeds to a soil-based herbicide, researchers at the University of Illinois were not able to find a single herbicide-resistant mutant. Though preliminary, the findings suggest that the mutation rate in amaranth is very low, and that low-level herbicide application contributes little — if anything — to the onset of

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