Weeds
When learning from agronomists and farmers about their experience with managing glyphosate resistant Canada fleabane, there is consensus that multiple strategies are needed and that simply tank-mixing another mode of action will not be a good long-term approach. Since 2016 we have evaluated different management tactics for Canada fleabane. READ…
Many farmers have witnessed the value in applying herbicides in the fall to perennial weeds, especially perennial sow-thistle and dandelion. Often they will see a reduction in their population the next year as well as a delay in their shoot emergence. This allows the planted crop to have a competitive…
Invasive plant species can pose a serious problem for farmers. The lack of native competitors or predator species often allows invaders to spread virtually unchecked, so a minor challenge can quickly become a major problem facing farmers across a large area. With a lot of time, effort and resources, the…
A team of University of Guelph researchers at the cutting edge of discovering how plants communicate with one another has proven the stress of “seeing” weed competition causes a plant to significantly change growth patterns and drop yield.  
In a study featured in the most recent edition of Weed Science, a team of researchers tilled four fields every two weeks during the growing season. They then monitored each site to quantify the density and species of seedlings that emerged from the weed seed bank six weeks after each…
In 2013, two University of Guelph weed scientists began collaborating on alternatives to herbicides for weed control. The report, by Francois Tardif and Mike Cowbrough, was released in 2016.
Multiple modes of action make a big difference when it comes to slowing down the development of herbicide-resistant weed populations. That’s the message echoed throughout Nufarm Agriculture’s field plot tour, held outside Saskatoon on July 5.The tour featured cereal, canola, soybean and pulse plots to demonstrate Nufarm’s line of herbicides…
Hard to identify and distinguish from one another, the annual grasses compete with winter wheat and fall rye because their growth habits are similar. Downy brome (Bromus tectorum) densities of 50 to 100 plants per square metre that emerge within three weeks of the crop can reduce winter wheat yields…
Japanese brome (Bromus japonicas) exists as a winter annual or summer annual grass weed in the Canadian Prairies.
New herbicide technology, carefully applied and coupled with managing modes of action, is Ontario’s best hope for winning the war against what is arguably the worst broadleaf weed in Canada today.
Key cropping strategiesThere are a couple of key cropping strategies that can have a major impact on weed seed predators.Avoid indiscriminate use of insecticides: "[It's] discouraged, as applications can also kill beneficial insects, as can some herbicides,” says Chris Willenborg, assistant professor in the department of plant science at the University…
Largely overlooked and previously not studied a lot in Canada, weed seed predation provides the second-largest loss of weed seeds from the seed bank, second only to germination. Although research has been almost exclusively carried out in Europe and the United States, recent research at the University of Saskatchewan proves…
In wheat, in canola or in pea, the message is the same: control weeds early for highest yields. Those messages have been repeated in the past and now new research highlights the need to repeat that same message with respect to wheat crops.
Glyphosate-resistant (GR) waterhemp was first found in Ontario in 2014, but it already has a foothold in three counties in the southwest of the province. Fortunately, Peter Sikkema’s research group at the University of Guelph’s Ridgetown Campus has made a good start on finding effective options for controlling this challenging…
Originally from Asia, woolly cupgrass has been in the United States since about the 1950s and has caused problems in field crops across the corn belt. This annual grassy weed was first found in Canada in 2000, when it was discovered in Quebec. Since then, government agencies and producers have…
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