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Tag Archives herbicides

These thriving kochia plants are probably resistant to more than one herbicide mode of action.
Crops

Using a multi-prong strategy against herbicide resistant weeds

There are more pre-seed control options available to suppress herbicide-resistance, but use cultural management as well

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Reading Time: 4 minutes More than half of western Canadian fields under annual crop production contain at least one herbicide-resistant biotype, according to surveys from 2014 to 2017. In Alberta, roughly 60 per cent of fields surveyed have resistant weeds; in Saskatchewan that figure is 57 per cent and in Manitoba it’s 68 per cent. “The surveys have been […] Read more
Canada fleabane rosette during October.
Crops

Pest Patrol: Management practices that controlled glyphosate-resistant weeds in 2020

#PestPatrol with Mike Cowbrough, OMAFRA

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Reading Time: 3 minutes Several Ontario agronomists recently shared their most successful strategies for managing glyphosate-resistant weeds. Four general strategies were identified: 1. Inclusion of winter wheat in the crop rotation By early spring, winter wheat’s dense ground cover does not provide a good environment for annual weeds, like waterhemp, to germinate. There are also many herbicides that are […] Read more
Palmer amaranth. (United Soybean Board photo)
Crops

Arkansas confirms first-ever glufosinate-resistant broadleaf

Researchers find Palmer amaranth strains in two counties

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Reading Time: 2 minutes Researchers in the southern U.S. have found what they say is the first broadleaf weed in the world to beat the active ingredient in BASF’s Liberty herbicide. The University of Arkansas last week announced its ag researchers had found glufosinate-resistant Palmer amaranth in crops in two eastern Arkansas counties across the Mississippi River from Memphis. […] Read more
(File photo by Dave Bedard)
Crops, Reuters

German cabinet approves legislation to ban glyphosate from 2024

Law would still need parliamentary approval

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Reading Time: < 1 minute Berlin | Reuters — Farmers in Germany will have to gradually reduce their use of glyphosate and stop using it completely from 2024 in order to preserve clean habitats for insects, under draft legislation passed by the country’s cabinet on Wednesday. “The exit from glyphosate is coming. Conservationists have been working toward this for a […] Read more
Figure 1: Annual bluegrass.
Crops

Pest Patrol: Bluegrass becomes an emerging problem in field crops

#PestPatrol with Mike Cowbrough, OMAFRA

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Reading Time: 4 minutes In Ontario, turf-like grassy weeds are being found in more cultivated fields. In herbicide-tolerant corn and soybean, control with glyphosate has been inconsistent. In cereal and forage crops, fast growth of these grasses in the spring makes them too big to be controlled with herbicides. Let’s review what is being found in fields and how […] Read more
Soybean planting showing leaf injury symptoms caused by a “bleaching” herbicide.
Crops, Soybeans

Pest Patrol: Crop injury from herbicide residues more common in 2020

#PestPatrol with Mike Cowbrough, OMAFRA

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Reading Time: 4 minutes In 2020, a few farmers observed leaf injury in their soybean crops. The injury caused parts of the leaf to turn white, then yellow (see photo at top). This injury is typically caused by “bleaching” herbicides. It was odd, though, because the bleaching herbicide had been applied to the previous year’s corn crop, and it […] Read more
Figure 1. Dog strangling vine along a roadside in York Region where it is creeping into the fenceline and bordering corn field.
Crops

Pest Patrol: Dog strangling vine control with herbicides

#PestPatrol with Mike Cowbrough, OMAFRA

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Reading Time: 2 minutes An invasive perennial weed from the milkweed family, dog strangling vine is extremely difficult to control once it gets established (Figure 1 at top). Progress has been made on biological control of this weed in Ontario through the release of Hypena opulenta, a leaf-feeding caterpillar. However, integrated strategies that include both biological and chemical methods […] Read more
A sight no one wants to see in soybeans: cupping of the leaves caused by dicamba.
Crops, Soybeans

U.S. legal system helps weeds win

Luckily, Canadian producers are still outside the reach of the Ninth Circuit Court ruling on dicamba-based herbicides

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Reading Time: 5 minutes In farming circles, the term “less-forgiving” has become more than a cliché. It’s now a mirror on reality. Farmers are already dealing with an incredible list of challenges and complexities, including everything from new seed technologies, concerns about land costs, equipment decisions, commodity markets, trade issues… you name it. Now growers in the U.S. must […] Read more
(Dave Bedard photo)
Crops, Reuters

Mexico to phase out use of glyphosate

Farmers to have until 2024 to phase out herbicide

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Reading Time: < 1 minute Mexico City | Reuters — Mexico will gradually phase out use of the herbicide glyphosate by the time the current administration ends in late 2024, President Andres Manuel Lopez Obrador said on Wednesday, following a ministerial spat over the product. Acknowledging differences between his agriculture and environment ministries over the herbicide, which is used in […] Read more

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