May 21, 2015 – Issue 10

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  • May 21 Quiz — Reseeding

    Sickly seedling Brackenreed small

    Frost, wind, cold soils and in some cases excess moisture have reduced canola stands. Some growers are thinking about reseeding. This week’s quiz provides some background to help with the decision.

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  • Top 10 things to look for after emergence

    Striped flea beetles. Credit: Denis Pageau, AAFC

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  • Help for the reseeding decision — scenarios

    Thin stand small

    When growers have canola stands of fewer than 4 plants per square foot — due to low seeding rates, poor seed survival, insects, crusting, frost, wind, etc. — they grapple with the question whether to reseed. An established canola stand with as few as 1-2 plants per square foot generally has higher economic potential than if were to reseed that crop in June. This population is far below the minimum 4-5 per square foot required to meet yield potential, but a thin stand seeded early has greater economic potential (considering yield, quality and cost of production) than an adequate stand that doesn’t get established until mid to late June.

    However, reseeding may be the better option if…

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  • How to assess frost damage on young canola

    Frost on vol canola 2 Ward

    After a frost, it can take a few days to accurately determine how many plants survived, and whether the stand is still uniform. Be patient before making any decisions. Check the whole crop the day after a frost and then again 3-4 days after a frost to assess the situation.

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  • Insect update: Flea beetle thresholds and frost

    This seedling was munched by flea beetles then hit by frost. Credit: Samantha Sentes

    Flea beetle thresholds don’t change with frost, but frost may have changed the crop assessment situation. Here’s how….

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  • Seeding into moisture: How low to go?

    Tillage can make dry soil conditions even worse.

    In dry soil conditions, growers may be tempted to seed deep enough to reach moisture. This is not necessary from April to mid-May, and may create more harm than good at any time. The common recommendation to seed no deeper than 1” still applies in dry conditions. Here’s why:

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  • Three timing options for early weed control

    Canola emerges with a large population of wild oats.

    Weeds will be going strong with the sun, especially if they have established roots that reach moisture while newly seeded crop battles dry topsoil conditions. A second pre-seed burnoff may be in order or — if emergence is likely to be slow — the post-seeding pre-emergence window may be a little wider than usual. Either way, early weed control remains important to maximize profit potential of the crop.

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  • Yield drops after 2-3 days in standing water

    Excess water stress small

    Canola is quite susceptible to water logging and shows a yield reduction after only 2-3 days in excessive moisture. Wait to see how the crop recovers before making decisions on reseeding or fertilizer top ups.

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