Weeds

  • Best timing for perennial weeds: Pre-harvest or post-harvest?

    Weeds

    If you have a canola field with a lot of perennial weed escapes, especially Canada thistle, are you better to spray them pre-harvest or post-harvest for maximum efficacy? There are benefits to both options.

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  • New glyphosate-resistant weeds moving north

    Weeds

    Tall waterhemp is confirmed in eastern Manitoba. Palmer amaranth is in North Dakota and moving north toward Manitoba and Saskatchewan. Both are big aggressive weeds with populations resistant to many herbicides, including glyphosate. If you find them, destroy them immediately.

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  • Test kochia escapes for glyphosate resistance

    Weeds

    Farmers will want to test escapes for glyphosate resistance so the weeds can be targeted for intense management before they start to shed their seeds.

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  • A case for combine weed-seed destroyers

    Weeds

    Breanne Tidemann, research scientist with Agriculture and Agri-Food Canada, has been researching combine weed seed destructors. They’re not perfect because some weed seeds will shed their seed before harvest and some weed seeds, like thistles, are too light and fluffy, but no IWM practice is perfect. When farmers employ a few of these imperfect tools, they can start to get close to long-term weed control that prevents herbicide-resistant weeds from taking hold and keeps yield loss to a minimum.

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  • Reader question: Late weed applications on stagey canola

    Weeds

    I have a field that is fairly dirty with kochia, cleavers and lamb’s-quarters. Half of the field is in 6-leaf and half is staring to bud. How much yield will I lose by spraying 0.5l of glyphosate on it?

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  • Suspicious weed patches? Check for resistance

    Weeds

    Important clues that a patch of weeds are herbicide resistant: One, the patch has no clear boundary. Two, the patch will be one species of weed that escaped the spray.

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  • Moisture-stressed plants and herbicide applications

    Weeds

    Clark Brenzil, weed management specialist with Saskatchewan Agriculture, provides the following consideration for spraying weeds after weather conditions have switched from very dry to very wet.

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  • Sprayer tank clean-out – tips

    Weeds

    This article underlines the importance of a complete clean out between products, and to understand the risks for each product and each tank mix presents.

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  • Second-pass herbicide: Why and when?

    Weeds

    A second in-crop spray only makes sense if weeds are plentiful, at the same stage or ahead of the crop and the canopy hasn’t closed. These weeds may have a large yield impact. This could be a common situation when dry conditions have hampered crop growth.

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  • Canola Watch quiz – Herbicide-resistant weeds

    Weeds

    Six questions about herbicide resistant weeds – causes and management

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  • Dry conditions. Should I spray weeds?

    Weeds

    If weeds are present, then yes, you should spray. In some ways, dry conditions should do more to encourage early spraying because you don’t want weeds taking up what moisture is there.

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  • Weed BMPs: Spray early

    Weeds

    We know that weed competition can greatly reduce canola yield. A combination of pre-seed weed control and one in-crop application before the 4-leaf stage of the crop is often enough to eliminate yield loss from weed competition.

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  • Weed control strategies for each HT system

    Weeds

    Here are strategies to improve weed control results for each herbicide-tolerant (HT) system: Falco, Clearfield, Liberty Link and Roundup Ready.

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  • Control big weeds early

    Weeds

    Flixweed, shown above, presents another possible risk – as a clubroot host. This adds to the incentive to spray it early.

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  • Two common questions after a spring frost

    Weeds

    Growers have two common questions after a spring frost: 1. Did the crop survive? (Do I need to reseed?) 2. When can I resume weed control? This article will help you answer both.

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