Weeds
Early weed control has many benefits as weeds compete with crops for nutrients, water, and light. “Research on weeds germinating before the crop emerges as compared to crop emerging before the weeds shows a very significant drop in yield loss when the crop emerges prior to the weeds,” says Harry…
In 2016, a survey conducted by the University of Guelph’s Ridgetown Campus found that producers believe lamb’s-quarters to be their “worst weed” overall across Ontario.
Herbicides have become very important for weed control. However, frequent and repeated use of the same herbicide groups has gradually resulted in development of herbicide-resistant weeds to the point that resistance has become a very serious problem for many Prairie farmers. When herbicide resistance is a relatively minor problem, growers…
In Western Canada, wild oat continues to be one of the most problematic weeds. As part of an integrated weed management strategy, researchers continue to look for additional options and different lifecycle timings to reduce populations, frequencies and herbicide resistant populations.
Weed control is one of the main challenges for flax growers, and is even more challenging under organic production systems. Because flax is a poor competitor with weeds, yield losses can be significant when weeds are present. Cultural and mechanical control options can be effective techniques for weed suppression and…
Grows more than two inches per day. Produces over one million seeds per plant. Grows 10 feet tall. Resistant to at least four different herbicide groups in the U.S. No wonder 200 American weed scientists in 2017 ranked Palmer amaranth the most troublesome weed in broadleaf crops, fruits and vegetables.
Last April, Real Agriculture agronomist Peter Johnson tweeted a photo of winter wheat seedlings surrounded by a tangle of chickweed. “Chickweed in wheat needs to be controlled in fall! Shepherds purse, stinkweed same. Too much spring competition!” he wrote.
Agriculture and Agri-Food Canada (AAFC)’s 2016 herbicide resistant weed survey in Manitoba highlighted increased resistance in grass weeds versus broad-leaf weeds in the province, according to AAFC resistance specialist Hugh Beckie.
From Ontario’s Essex County to Glengarry County (located 800 kilometres away), glyphosate resistant (GR) Canada fleabane is wreaking havoc on valuable crop fields. The most economically significant GR weed, GR fleabane is both challenging and expensive to manage.
Over the past several years, Neil Harker, research scientist with Agriculture and Agri-Food Canada (AAFC) in Lacombe, Alta., has been investigating integrated weed management systems (IWM), with a focus on wild oat management and control. An early study, Test 42, compared ways of managing wild oat using crop rotation (barley-canola-barley-peas…
After 44 years, you would think something would change. But in the latest Prairie Weed Survey report, green foxtail, wild buckwheat and wild oats still come out on top as the three most troublesome weeds, measured as relative abundance.  
According to Peter Sikkema, professor of field crop weed management at University of Guelph’s Ridgetown Campus, glyphosate-resistant Canada fleabane was first found in eight fields in Ontario’s Essex County in 2010.
Dr. Peter Sikkema and Dr. Darren Robinson, weed scientists at the University of Guelph, will be hosting an intensive course on herbicide activity (mode-of-action, selectivity, efficacy, crop injury) and weed identification in London, Ont., this coming fall. 
Upping the seeding rate was the single most effective tool for increasing yield and suppressing weeds in flax grown under organic management, a University of Saskatchewan study shows.Researchers Lena Syrovy, Yanben Shen and Steve Shirtliffe, studied seeding rates and mechanical weed control methods including using a inter-row cultivator, a rotary…
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…
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