August 6, 2015 – Issue 20

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  • August 6 Quiz — Green worms

    Quiz 2 (Mike Dolinski)


  • Try this handy tool:


    The quick and easy pre-harvest interval tool — the spray-to-swath calculator — helps you find a fungicide, insecticide or pre-harvest herbicide that fits your timeframe available.


  • Lygus nymphs: Which ones do you count?

    Don't count these tiny ones without the black dots. This photo was taken on a lined notepad to show the size. Source: Justine Cornelsen

    When doing lygus counts, include adults and late instar nymphs. Nymphs are young lygus, and only the larger nymphs do enough damage to be included in sweep net counts. A key feature is the black dots on the back. Count nymphs with dots. Don’t count them if they’re small and don’t have the dots (like the one above).


  • Begin your pre-harvest disease watch

    When ground-truthing this image taken with the CCC drone, agronomist found about 10-15% of plants infected with sclerotinia stem rot. Photo credit: Amanda Wuchner

    Three major stem diseases — blackleg, clubroot and sclerotinia stem rot — are more easily identified in the weeks leading up to harvest. Areas of the field with prematurely ripening plants and excessive lodging are signs that any one of these three diseases could be present.


  • Five steps to prep for lower losses this harvest

    1. When you pull out the combine to get it ready for the season, look it over for holes and cracks in the pickup, feederhouse, elevator, shoe seals, separator covers and the grain tank. Canola seed can dribble out these openings even before it reaches the back end…


  • Bought a used combine? Check it for soil

    Buying used equipment from a clubroot area can create an unexpected transfer of the disease. We heard this week of a grower from northern Alberta who bought a used combine from a known clubroot area. The grower was surprised at how much soil was on and inside the combine, and this soil very likely contained clubroot spores.


  • Swath timing for higher yield

    The optimal swath timing for canola yield and quality is when 60% of seeds on the main stem are showing some colour change. Seed colour change (SCC) is considered any amount of yellow or brown on the seed. This increases crop yield because side branches have longer to fill and average seed size for the whole plant is larger.


  • Straight combining canola: Reducing the risk

    Straight combining

    Growers who want to try straight combining for the first time, keep these risk scenarios in mind….


  • Proactive steps for a safe harvest

    The following tips are from the SAFE Farms Harvest TIP sheet. Download the complete document.


  • Coming events

    Canola Galla 2015 — August 19, Penhold, AB
    Harvest timing and Palooza plot tour — August 19, Lacombe, AB
    Canola Discovery Forum — October 27-29, Canmore, AB

    Read more for registration links


  • Late season hail: Damaged pods and swathing timing

    These white spots on pods and stems are hail damage. These plants and seeds should be fine, but more intense hail could have damaged and bruised seed.

    Late season hail can damage pods and increase the shattering risk for those pods. Before jumping the gun and swathing too early, take these decision-making steps….


  • Diamondback moth larvae — Thresholds

    Diamondback moth larvae feeding on pods.

    Thresholds are 100-150 larvae per square metre in immature to flowering plants and 200-300 larvae per square metre (20-30 per square foot) in plants with flowers and pods. While these nominal thresholds are based on dense stands of 150-200 plants per square metre, plant population is not a major factor. Fewer plants will have more branching and more pods, so the number of pods per square foot probably won’t change much regardless of plant population.


Canola Watch