Weeds

  • Herbicide carryover, sprayer contamination or something else entirely?

    Weeds

    Injury from herbicide residue in the soil can only occur in fields with a history of Group 2, 4, 5 and 14 herbicide applications. While soil characteristics and dry conditions can extend the at-risk period for these herbicides, carryover issues often occur when required recropping intervals are not followed. For example, Roundup Ready or Liberty Link canola cannot be seeded on fields that had Group 2 imazethapyr (Pursuit, Odyssey) the previous season. Here are typical symptoms for canola damaged by herbicide residue from these 4 groups…

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  • Tips for spraying in the wind

    Weeds

    How do you spray weeds in a timely fashion when every day seems too windy? Here are some tips….

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  • Spray early: Economics of early weed control

    Weeds

    One of our Alberta agronomy specialists encountered the situation in the photo. Canola emergence was patchy in this small area, but generally good overall. The bigger issue was the big population of tiny weeds. The agronomy specialist wondered if these buckwheat seedlings, though very abundant, were too small to spray? The answer is no.

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  • Scouting 7 to 21 days after seeding: What to look for?

    Weeds

    With warm soils, decent moisture and 1” seeding depth, emergence can occur about a week after seeding. If emergence is slow or patchy, scout to find out why. The first 21 days are critical to a successful canola crop.

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  • What causes herbicide carryover damage?

    Weeds

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

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  • Canola Watch quiz – Spraying

    Weeds

    A quick quiz to test spraying windows, inversions and timing.

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  • In-crop herbicide timing – scenarios

    Weeds

    In general, early weed control is best. A few early weeds emerging before or at the same time as canola plants are much more damaging to yield than lots of weeds emerging after canola plants are established. Those early-emerging weeds tie up nutrients and moisture valuable to the crop and can also out-compete the crop […]

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  • Tank mixes of herbicides and insecticides or fungicides

    Weeds

    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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  • Top 10 weed spraying topics

    Weeds

    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

    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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