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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

By
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
Comment, Op/Ed

Comment: Glyphosate and livestock. It’s all in the dose

Studies have found no effect on digestive bacteria or nutrient uptake

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As an animal nutritionist, I’m concerned about the health and welfare of farm animals. Animals that are stressed due to inadequate housing conditions or nutrition are less sustainable. That’s why I read the article “Herbicides and Horses” with great interest. In the article, the author speculates that glyphosate’s chelation and antimicrobial properties can have negative
Frosty weeds and closing spray windows
Crops

Frosty weeds and closing spray windows

Variables like weed species and recent and expected frosts will weigh into management decisions

By
Add the weather forecast into your calculations when planning fall weed control. It’s prime weed control season for perennial weeds like Canada thistle and winter annuals and acting now can help you, come spring. “A lot of the winter annuals are starting to become problems because if we don’t do any kind of control in
Herbicides and horses
Columns, Livestock

Herbicides and horses

Horse Health: A ubiquitous herbicide is beginning to come under increased scrutiny by scientists

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The implications for the widespread use of glyphosate-based herbicides in our environment has been increasingly mired in controversy despite regulatory assurances of safety. After close to three decades of use there is a growing body of scientific evidence emerging which presents unintended biological consequences of this chemical and its formulation. Research is postulating adverse mechanisms
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
Dicamba-resistant Palmer amaranth is showing up in Tennessee. Farmers there are already in a battle with glyphosate-resistant Palmer amaranth.
Crops, News

Dicamba-resistant Palmer amaranth found in U.S.

Farmers there started growing dicamba-tolerant soybeans in 2016

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The list of herbicide-resistant weeds continues to grow. Dicamba-resistant Palmer amaranth weeds have been found in parts of Tennessee, University of Tennessee Extension weed specialist Larry Steckel wrote in a July blog. “Results from some of the greenhouse experiments this winter and spring, as well as in-field research this growing season, would suggest that our
Weather conditions that can volatilize dicamba herbicide
Crops

Weather conditions that can volatilize dicamba herbicide

Avoid applying all herbicides during temperature inversions too

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In addition to drift caused by wind the herbicide dicamba can end up off target due to volatilization, also referred to as vapour drift, and temperature inversions. Last week’s stories on dicamba (see ‘Related Articles’ below) prompted a reader to ask about the weather conditions for both. The University Minnesota explains it on its website
A dicamba-damaged soybean plant.
Crops, News, Other

Canadian, U.S. farmers diverge on dicamba spray issues

While U.S. farmers have been devastated by dicamba drift, it’s been a non-issue in Canada

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Canadian farmers haven’t experienced the same dicamba drift debacle their U.S. neighbours have — but that doesn’t mean they won’t also pay a price for this high-profile failure. Spray expert Tom Wolf says a cooler climate and differences in the way the product is used here have spared Canada the worst immediate effects. The bill
Crops, News

Dicamba spray drift declining in Canada

The climate and how the herbicide is used here both are factors

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There haven’t been many dicamba drift complaints in Canada since Monsanto commercialized dicamba-resistant soybeans in 2016. In 2019 Health Canada received just “16 reports of dicamba-related environment incidents in Canada related to drift and over-the-top application of dicamba to soybean,” a Health Canada official wrote in an email June 10. Health Canada, which regulates pesticides in Canada through the

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