Weeds-general-other

  • New glyphosate-resistant weeds moving north

    Weeds-general-other

    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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  • A case for combine weed-seed destroyers

    Weeds-general-other

    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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  • Suspicious weed patches? Check for resistance

    Weeds-general-other

    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-general-other

    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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  • Canola Watch PHOTO quiz – Scouted this week

    Weeds-general-other

    Scouting for the season should start right at emergence. That way you can spot some of the early-season issues featured in this week’s photo quiz.

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  • Timing the narrow post-seeding / pre-emergence spray window

    Weeds-general-other

    Growers who seed before spraying may choose to apply in the narrow post-seeding pre-emergence window, but consider the following risks….

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  • Herbicide-resistant weeds: prevention and management

    Weeds-general-other

    Here are tips to prevent the development and spread of glyphosate-resistant kochia (as shown in the map) and other herbicide-resistant weeds.

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  • Biobeds: What are they and why build them?

    Weeds-general-other

    A pesticide rinsate biobed can prevent the environmental contamination of surface and groundwater by pesticides. Instead of being disposed of directly on land, at the edge of a field or elsewhere, the rinsate from the sprayer can be applied to the biobed (so it is contained).

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  • Dry conditions elevate herbicide carryover risk

    Weeds-general-other


    Residual herbicides need a moist environment for herbicide breakdown to occur within the expected time-frame. In dry conditions, the two major breakdown methods – hydrolysis or microbial degradation – will slow down, which elevates the carryover risk.

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  • Spraying weeds after frost and snow

    Weeds-general-other

    Spray decisions — when to spray or whether to spray at all — will depend on leaf condition after the snow is gone.

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  • What causes herbicide carryover damage?

    Weeds-general-other

    Factors that affect herbicide carryover are herbicide group, field history, soil characteristics, dry conditions and temperature.

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  • Tank mixes of herbicides and insecticides or fungicides

    Weeds-general-other

    Sprayer in canola Cheri Jacobsen small

    Combining pest control operations to save trips over the field may seem like good economic sense, but consider the following when making this decision:

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  • What’s the Buff? Don’t spray sensitive areas

    Weeds-general-other

    Buffer zones or strips come in all shapes and sizes, and are designed to protect sensitive areas. Sensitive areas include permanent vegetation to maintain good water quality (riparian areas around rivers, lakes and ponds), control erosion (shelterbelts) or provide wildlife habitat. These areas are also typically habitat for pollinators and other beneficial insects.

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  • Top 10 weed spraying topics

    Weeds-general-other

    We dug into our vast vault of Canola Watch articles to put together this Top 10 list.

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  • Tips for spraying weeds in dusty conditions

    Weeds-general-other

    Dusty conditions are common in spraying, and in dry springs they are often associated with a further challenge – drought-stressed plants. There is no magic cure for these problems, but Tom Wolf provides these guidelines….

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