June 27, 2012 – Issue 18

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  • Issues of the week

    Canola fields are being assessed for sclerotinia stem rot risk, especially with decent moisture, dense canopies and good yield potential. We have tips this week on how to assess the risk in each field. Tomorrow’s webinar with Kelly Turkington will help answer more of your questions.

    Growers are reminded to include lygus bugs in their insect scouting.

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  • Photo quiz of the week

    What is the bloom stage of the canola in these photos? Take the short quiz to share your answers.

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  • Second weed spray may not pay

    Growers who usually spray twice may not need to spray a second time this year if the canopy has closed, weeds are behind the crop, and the recommended application window is past. If the opposite is true, growers have to decide whether weed competition costs exceed potential yield loss.

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  • How to assess the sclerotinia stem rot risk

    Moisture is the key factor in sclerotinia stem rot risk. Good soil moisture and a few rains in the period starting two weeks before flowering and carrying through to infection after flowering will greatly increase the sclerotinia risk. Fungicide sprays, if applied, need to go on canola at between 20% and 50% flower. See this week’s photo quiz for a hint at what these stages look like.

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  • How to top dress N

    When topping up with liquid fertilizer, the ideal is to apply when leaves are moist from early dew or a light rain so liquid nitrogen fertilizer runs off quickly. Applying when hot and dry can increase absorption of liquid into the plant, increasing the amount of burn. Consider adding some extra water to the tank in these conditions if waiting is not an option. Use straight stream applicators, not fan nozzles, and use some pressure to drive the stream to the ground. Keep in mind that windy conditions may disrupt the streams and lead to increased plant coverage and potential for damaging greater leaf area.

    Broadcast spreading of urea or surface dribble banding of UAN are the most

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  • Insect update: Lygus scouting tips

    Insecticide control at the bud stage is rarely effective or economical even when counts are 15-20 per 10 sweeps. Under good growing conditions, canola can grow through this early damage without any yield loss. In some cases canola can actually yield more if some early bud feeding occurs. Lygus control at the bud stage may be warranted if all buds are being damaged and the crop isn’t coming into flower. Otherwise hold off on spraying and be ready to take action at the pod stage if necessary.[/caption]

    Lygus monitoring has begun and so far the threat seems minimal for most fields. That can change quickly.

    Scouting tips:
    —When possible, sample when conditions are warm, sunny and not too

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  • Insect update: diamondback, weevil, cutworm, bertha, beneficials

    Probably too early to spray cabbage seedpod weevil, diamondback continue feeding, bertha moth numbers are high in some regions, cutworms near the end but still active, and always think about those valuable beneficials — like those helpful killers, the lady bugs.

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  • Hail reported, some severe

    Canola hit with light to moderate hail at up to 20% flower may recover with only minimal to moderate yield loss. Plants will flower longer and compensate. More severe damage warrants a call to the insurance adjuster.

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  • Coming events

    Alberta Growing with Canola crop walks Tuesday, July 3 in Forestburg. CCC agronomy specialist Dan Orchard will be present. Tuesday, July 3 in Westlock. CCC agronomy specialist Doug Moisey and AARD canola specialist Murray Hartman will be present. Tuesday, July 3 in Barrhead. CCC agronomy specialist Doug Moisey and AARD canola specialist Murray Hartman will […]

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