June 29, 2011 – Issue 14

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  • Issues of the week

    Many canola fields are under stress from excess water. A fertilizer top up may help, but hold off until the ground dries up and the crop starts actively growing again before making this investment. Rains have also delayed timely herbicide applications, so many growers are wondering about the real yield risk if they spray after […]


  • Crop and weather update

    Peace (B.C. and Alberta): South and central Peace regions got a lot of rain in the past week, with accumulations of 4” to 7”. Canola in low areas is yellowing as a result of moisture stress. Crops not drowning are advancing quickly. Some canola is at 20-30% bloom. While the south is soaking, north Peace […]


  • What is the goal with a late herbicide spray?

    Herbicide labels say that glyphosate and Odyssey cannot be applied to canola after the 6-leaf stage and Liberty cannot be applied after early bolting. These limits are in place to ensure effective product performance and crop safety. Later applications can lead to reduced weed control due to advanced weed staging and reduced herbicide contact with the weeds through the increased canola canopy closure. Late applications can also sometimes cause canola buds to abort, increasing the potential for permanent yield loss.


  • 5 key questions about sclerotinia spraying

    If fields are moist at the time of flowering, and canola has good yield potential (e.g. 30 bu./ac. or more), then it will probably pay to spray a fungicide to limit sclerotinia losses. Here are a few important questions about the disease:


  • Insect update: Lygus bugs and cabbage seedpod weevil

    Lygus bugs are feeding on canola in the Peace River region and in some parts of central Alberta. Insecticide control at the bud stage is rarely effective or economical. Under good growing conditions, canola can grow through this early damage without any yield loss. Instead of spraying, step up monitoring and proper sweep net sampling and be ready to take action at the pod stage if necessary.


  • Fungicide and insecticide tank mixes

    Canada’s crop protection rules allow growers to tank mix two products as long as they are both registered for the crop in question and at the timing and rates used. But these rules do not ensure these products can be mixed without problems in the tank (they may create a gummy mixture that ruins the sprayer) or without antagonizing each other (both products becoming less effective.)


  • Top dress canola with sulphur deficiency

    Some canola fields are showing signs of sulphur deficiency. Without enough sulphur, it doesn’t matter how much of the other nutrients are available, the canola crop cannot produce top yields. Post-emergence sulphur can be applied up to early flowering and still provide a yield benefit.


  • Return unused seed for a refund

    Seed companies encourage growers to return unused unopened bags of canola seed. That way the seed company can ensure that seed is stored properly to maintain its high quality. Growers get their money back. At least one company has a deadline of June 30, so if you have seed to return, you may want to check right away.


  • Coming events

    These upcoming tours and events involve the Canola Council of Canada and/or will cover canola agronomy topics.


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