June 26, 2013 – Issue 13

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  • Issues of the week

    Flooded canola near Brandon, Manitoba.

    With rainfall general across the Prairies — excessive in certain areas — and with flowering just around the corner, the sclerotinia stem rot risk is building. Assess the situation field by field to see which may warrant a protective fungicide.

    Excessive moisture can cause leaching of nitrogen and sulphur. Assess yield potential and root depth to see whether a top dress application of N and S fertilizer is worthwhile.

    Monitoring for bertha armyworm moths, diamondback moths, and cabbage seedpod weevil begins. But these aren’t the only insects to watch for. Red turnip beetle, root maggots, lygus and cutworms are out there. “Watching” doesn’t mean “spraying” but scouting is still important to know what’s happening.

    Many crops are near the 6-leaf stage, which means the weed control window is closing. Aerial is one option if fields are too wet for the sprayer and you need to spray now to stay on label. Another option for perennial weeds that have escaped but are delayed relative to the crop is to wait and use pre- or post-harvest glyphosate — especially if weeds are delayed enough to avoid seed set prior to swathing.

    The CCC Crop Production team was active last week tweeting from the International Clubroot Workshop in Edmonton. Search the hashtag #ICW2013 to see the conversation. The Top 10 article this week is gleaned from those tweets. Here’s one of them:

    Tweet of the week June 26

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  • Canola Watch quiz

    June 26 quiz

    What are these arrows pointing at?

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  • Top 10 tips from the 2013 International Clubroot Workshop

    International Clubroot Workshop logo

    1. Have a plan to manage clubroot. Don’t wait until clubroot manages you. Whether you’re a farmer, agronomist, county/municipal staff, extension, or from the oil & gas industry, you need a clubroot management plan. A plan should include answers to the following: How will you quarantine a field? How will you plan your field work? When will you sanitize your equipment? When will you use resistant varieties? Visit www.clubroot.ca for help with your plan. Read more to see the other 9.

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  • Excess moisture: Canola damage and agronomy response

    Wet soils cause an oxygen deficiency, which reduces root respiration and growth. Root failure reduces nutrient uptake, and plants will eventually die unless drowned areas dry out quickly. A few days in waterlogged soil can be enough to kill canola plants, and yield loss is certain — although as canola plants age, they tend to be more resilient.

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  • Excess moisture and nutrient loss

    Flooded canola Sekulic small

    Growers can expect to see some nitrogen loss from extended heavy rains, probably in the range of 20-50%. Before top dressing, wait to see how the crop recovers from saturated soils before investing any more in fertilizer. Don’t do anything while soils are still wet — roots cannot take up nutrient when soils are saturated. Applying nutrient direct to leaves doesn’t help. Most foliar-applied nitrogen is washed off and then goes into the root zone. Uptake through the leaves is minimal.

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  • Improperly cleaned sprayer tank means crop damage

    We’ve had reports this week of growers causing unexpected damage to canola because the sprayer was not cleaned properly. The ideal tank cleaner has a detergent, a surfactant and a component to increase pH (i.e. ammonia) in one formulation. The detergent will cut any oils or fats found in current adjuvants, the pH increaser solubilizes the Group 2 herbicides and encourages chemical hydrolysis of some products, and the surfactant makes sure that droplets don’t hang on the sprayer surfaces. Think of the spot free rinse at the car wash.

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  • Moisture is the top sclerotinia risk factor

    With ample moisture evident in this canopy, these petals fallen near the main stem will likely lead to sclerotinia infection unless they've been sprayed.

    Growers with high risk conditions for sclerotinia stem rot may want to get their management plan in place. Booking fungicide may be worthwhile if you have a preferred product. This is pre-planning only. Fungicide applications must target flowers to be effective, so do not spray until a field reaches at least 20% flowering.

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  • Ultimate Canola Challenge – Saskatchewan

    125% of recommended nitrogen.

    The Scott site has been swathed for about a week, as of August 28. Visually, maturity and biomass show no apparent differences among treatments. Plots will likely be harvested by September 3.

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