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Tag Archives herbicide

Critical weed-free period in corn
Corn, Crops

Critical weed-free period in corn

Keeping your corn crop weed free through the key stages can lead to higher yields

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The critical weed-free period (CWFP) in corn takes place from emergence to V4 stage (six-leaf stage). Although corn is typically seen as a longer-season crop, maintaining a clean, weed-free field during this period is critical. A weed-free field is important during all stages of the CWFP. Corn isn’t a very competitive crop, so during the […] Read more
Group 2 (Odyssey) injuries in canola on display at CanoLAB 17 in Vermilion. Staff mimicked a drift injury in the greenhouse. Herbicide injury symptoms, 
such as purpling and thickened stems, can mimic other issues.
Canola, Crops, Features

Diagnosing herbicide injury

Application can go wrong. Know how to limit and recognize herbicide injury

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When it comes to diagnosing potential herbicide injury, record keeping is vital, say Canola Council of Canada agronomists. “With soil residual herbicides, herbicide history is really important,” says Ian Epp, agronomy specialist with the Council for northwestern Saskatchewan. Because soil residual herbicides are often applied the previous year, good record keeping is important, he adds. Last […] Read more
After Don sprayed his durum, the crop seems to be 
set back and yellowing in patches.
Cereals, Crops, Features

Crop Advisor’s Casebook: Dealing with damaged durum

A Crop Advisor's Solution from the March 14, 2017 issue of Grainews

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Don’s 3,000-acre mixed farm can be found south of Weyburn, Sask., near the U.S. border. He called me last June after he discovered patches of yellowing durum wheat plants in his field. Don had sprayed the crop at the three-leaf stage with a tank mix of Groups 1, 2 and 4 herbicides to control grasses […] Read more
Seven days after Ken sprayed his herbicide-tolerant canola crop, most of the plants in one field were dead or dying.
Canola, Crops, Features

Crop Advisor’s Casebook: What caused this 80 per cent loss in canola?

A Crop Advisor's Solution from the February 21, 2017 issue of Grainews

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Ken, a central Alberta producer who farms 2,000 acres of cereals and oilseeds, in addition to 150 head of cattle, called me after he discovered 80 per cent of the canola plants he’d seeded in one field were dead in the seed row. He thought the problem might be a sprayer issue, since a prominent […] Read more
To date, AAFC’s Dr. Hugh Beckie has not seen Palmer amaranth in the Prairies. However, he says, 
“if it did come up it would be through the floodwater in the Red River Valley.”
Crops, Features

Palmer amaranth continues to spread north

Producers should learn to spot the tall, fast-growing 
weed before it becomes a problem

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Amaranth is extremely nutrient-rich. It was important to the Aztecs, and is still cultivated in South America and Mexico. It germinates easily, grows rapidly and produces huge numbers of seed. But the crop that sustained the Aztec economy famously wreaked havoc on the American cotton industry, and is now affecting corn and soybean producers in […] Read more
Conquering wild oats in your fields
Crops, Features

Conquering wild oats in your fields

Tight rotations and resistant plants mean wild oats are prevalent on the Prairies

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We spend more money trying to manage wild oat in Western Canada than any other weed, says Dr. Neil Harker, a weed ecology and crop management scientist with Agriculture and Agri-Food Canada. “It’s a driver weed.” Here’s a bit of a refresher on wild oat, what’s new with research, and what you need to know […] Read more
Cleavers can have a negative impact on canola and pulse crops.
Crops, Features

Controlling cleavers without quinclorac

With quinclorac off of the herbicide menu, farmers will need to use other tools

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Last spring, the Western Grains Elevator Association (WGEA) and the Canadian Oilseed Processors Association (COPA) advised growers that they would not accept quinclorac-treated canola grown and harvested in 2016. The reason for this announcement was to make sure that grain shipped to customers in other countries remains in compliance with regards to Maximum Residue Limits […] Read more
“It’s tempting to spray while it’s calm, but if there’s no wind the droplets will often stay suspended for a while behind the sprayer,” says Dr. Tom Wolf.
Crops, Features

Herbicide drift not always wind-based

Spray drift can also happen when it’s calm, and the consequences can be dire

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As many farmers have found out the hard way, herbicide doesn’t always go where you direct it. “Any time an application of spray is made, there are always small droplets that can move away from the intended target,” said Dr. Tom Wolf, applications specialist with Agrimetrix Research & Training. Generally speaking, herbicide drift is linked […] Read more

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