Weeds
You’ve scouted and know what weeds are present in your fields. You’ve paid attention to what weeds are prevalent in your region. And you’ve used an integrated management strategy that combines treating with the recommended modes of actions and using cultural practices like planting clean seed, controlling weeds along field…
There are now 41 glyphosate-resistant weeds in the world. Seventeen of those occur in the United States. There are six species in Canada, and four of those occur in Ontario. In Ontario, glyphosate-resistant giant ragweed was confirmed in 2008, Canada fleabane in 2010, common ragweed in 2011 and waterhemp in…
Presented by Breanne Tidemann, Agriculture and Agri-Food Canada, Lacombe, Alta., at the Herbicide Resistance Summit, Feb 27-28, Saskatoon.In order for harvest weed seed control (HWSC) to be effective, weed seeds still have to be retained on the plant at the time of harvest. If they’ve already dropped to the soil,…
Implementing a winter canola-soybean double crop can be a potential way to overcome challenges in soybean and canola production in Ontario, according to OMAFRA's latest CropTalk newsletter.Eric Page, research scientist in weed ecology, and Sydney Meloche, weed science technician, at AAFC Harrow Research and Development Center have conducted planting trials…
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.  
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