Seedling disease complex

  • Damage ID: Cutworms or seedling diseases?

    Seedling disease complex

    Cutworms clipped this plant. The investigation included digging to discover cutworms present and observation of the plant damage, which looked like biting not rotting.

    Cutworms and seedling diseases are fairly common causes for toppled or missing plants this time of year. Here are a few tips to help you distinguish which is at work….

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  • Slow emergence and seed treatments

    Seedling disease complex

    Seeding into warmer soils speeds up emergence and makes it more uniform

    Slow canola emergence due to cool soils can increase the risks from seedling diseases and from flea beetles.

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  • Seedling diseases in deep-seeded canola

    Seedling disease complex

    The long hypocotyl suggests this canola was seeded much too deep. Rhizoctonia infected the stem.

    Canola seeded too deep is at higher risk of seedling diseases. Deep seeding requires a long hypocotyl for the plant to reach the soil surface, which exposes more of the plant to soil-borne disease pathogens. Deep seeding also extend the days to emergence, which means the plant is at its vulnerable stage for longer.

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  • Moist soil increases seedling disease risk

    Seedling disease complex

    The seedling diseases risk increases with moist soil conditions and with tight canola rotations. The three best management steps for canola in this situation are: 1. Use treated seed. 2. Seed shallow. 3. Don’t cheat on the seeding rate, especially if seedling diseases have been a problem in past years.

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  • Early seeded canola slow to emerge

    Seedling disease complex

    When the warmer weather returns, as is forecast later this week, canola still in the seedling stage that was seeded over 3 weeks ago may be at high risk of flea beetle damage. Also, dig down to look at the seed. A soft mushy seed is dead — likely from disease — and will not emerge.

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  • Scout early to detect seedling diseases

    Seedling disease complex

    Growers who seeded canola a couple weeks ago will want to start scouting now for emergence issues. Often if seed and seedlings are damaged by rots and blights, which tend to be a more common occurrence in cool soils, they will quickly dry up and disappear. You need to act fast to accurately diagnose the problem.

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