Frost

  • Spraying weeds after frost and snow

    Frost

    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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  • Frost hits canola. What do you do?

    Frost

    Default to waiting. Don’t make a snap decision to swath. Before taking any harvest action, start with this sequence….

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  • Swathing after a frost

    Frost

    Frost on pods can stop plant development and lock in green. It can also cause pods to split. However, a light frost may have no effect at all, and the crop will be better left to mature fully before swathing.

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  • Frost hits standing canola. What to do?

    Frost

    You have two choices in this situation: Swath now or wait.

    Swathing now might prevent further seed loss if severe frost damage will soon cause pods to pop open and pedicels to snap. You could have shriveled seeds and high green counts, but that might be better than the potential losses from waiting. But if frost did not kill the plants, swathing early will halt any upside potential you’d have from leaving the crop standing to fill out more seeds and clear more green.

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  • Spring frost: Take a few days to assess the situation

    Frost

    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?

    Here are our answers….

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  • Novel products: Run your own tests

    Frost

    Rescue treatments for hail, excess moisture and other stress factors are rarely tested in broad scientific studies. Growers considering these treatments have to remember the decision comes down to “buyer beware”.

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  • Top 10 things to look for after emergence

    Frost

    Crucifer and striped flea beetles are feeding together in this crop. Credit: Brent Wiebe

    Flea beetles are just one thing to look for while scouting one to three weeks after seeding.

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  • Frost: Canola’s resilience may surprise you

    Frost

    May seeded plots show evidence of frost damage but the surviving plant population is still very good.

    Canola seedlings at the canolaPALOOZA site in Lacombe, Alberta, were hit by three -4°C frosts and one -3°C frost over a five-night period May 10-14. Yet photos taken the morning of May 16 show that a decent number of seedlings survived.

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  • Scouting: The critical first 21 days

    Frost

    The seedling on the left has wirestem.

    The week after seeding is a good time to verify seeding depth and to check seeds and seedlings for rots and blights. Disease damaged seed and seedlings die quickly, and may be gone within a few days, which is why this timing is important to an accurate diagnosis.

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  • Reseeding: The May option

    Frost

    Yield potential for canola seeded in late May is not as high, generally, as canola seeded in early May, but it is still pretty good and better than for canola seeded in June. Given the current date, the argument in favour of reseeding a crop clearly thinned out and set back by frost or any other issue may have more merit.

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