July 9, 2014 – Issue 14

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  • Four the week

    Missing pods

    Blasted heat. A long stretch of hot weather at flowering can greatly reduce canola yield potential. Even with a few days of heat, hormone balance and regular pod formation can take a week to return to normal. (See the photo above.)

    Hot sclerotinia. Hot and dry conditions can reduce the sclerotinia risk significantly. However hot and humid conditions may not reduce the risk — especially if the ground is still wet and canopy humidity is especially high.

    Need trumps convenience. Fungicide and insecticide can be mixed to add some efficiency to spray operations during flowering, but make sure both are really needed. Adding insecticide for convenience when insects are not at thresholds puts beneficials and pollinators are at unnecessary risk.

    Few threats. Insects are not a major issue for most growers, although cabbage seedpod weevil spraying is planned for many fields in southern Alberta. Keep looking and be prepared.


  • Map of the week

    This map shows the maximum daily temperature for the week of July 2-8. Source: WeatherFarm
    Weekly max temps_Prairie_July 1-7 2014 legend

    The heat is coming, as many of you will have already noticed — and as this map shows. These are the maximum temperatures reached across the Prairies for the week of July 1-7. Thanks to WeatherFarm for this map. Find more maps and weather information at their website: www.weatherfarm.com.


  • July 9 Quiz

    Damage to florets as a result of swede midge feeding. Source: Julie Soroka

    What caused the damage to these buds? We have this question, and three others specific to sclerotinia stem rot management.


  • Sclerotinia stem rot: Common questions

    Updated June 23, 2016. Email whetterj@canolacouncil.org if you have further updates.

    The table above shows fungicides available to manage sclerotinia stem rot. The article answers a few common questions on sclerotinia stem rot management….


  • Insect update: Beneficials, CSPW, root maggots

    Banchus is a parasitoid of bertha armyworm. It can be harmed by unnecessary insecticide sprays. Source: Lloyd Dosdall

    Beneficials. Lygus, bertha armyworm and diamondback moth have a number of natural enemies that will keep populations in check. These beneficial insects may not control an immediate pest threat that has already exceeded thresholds — growers will still have to spray in that case — but beneficials can keep a lid on populations. The key to preserving beneficial insects is to follow thresholds and spray only when necessary. Click here for beneficials to look for while scouting.

    Read more for updates on cabbage seedpod weevil, cabbage root maggot and others….


  • Top 10 things to scout for this week

    Canola at 20% flower. Source: NDSU

    1. Flowering percentage to determine timing for fungicide. The photo above from NDSU shows canola at 20% flower, which is when the application window opens. To assess flowering progress, concentrate on the main stem only. Count all flowers, including aborted flowers and developing pods. With 15 flowers main stem, the field is around 20% flower.

    Read the other nine….


  • Excess moisture: Nutrient deficiencies

    Moisture stress.

    Canola in fields with excess moisture will often show various signs of stress, including yellowing, purpling, stunted growth — or all of three. Excess moisture creates two problems for crop nutrition: (1) It can remove nutrient from the soil. And (2) it can “drown” roots and make it impossible for them to take up nutrients — even if nutrients are present in ample quantities.


  • Visit our Ultimate Canola Challenge sites


    The CCC’s Ultimate Canola Challenge sites across the Prairies will be part of research field days this month, including Outlook tomorrow and Scott next Wednesday.


Canola Watch