July 2, 2015 – Issue 16

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  • July 2 Quiz – flowers

    Quiz 2

    What has damaged these flowers…?

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  • No cause identified for mystery symptoms

    Mystery symptoms 6. Credit: Gregory Sekulic

    Under various conditions the past decade, some canola fields have exhibited stunting and strange deformities in bud clusters — as demonstrated in the photo gallery in this article. The cause remains a mystery.

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  • Insect update: Grasshoppers, lygus, cabbage seedpod weevil

    grasshopper feeding small

    Grasshoppers may be above thresholds in some fields. The nominal threshold for grasshoppers in canola is 8-12 per square metre, although the higher end of that range may be more appropriate in a typical canola crop. Grasshoppers are often at higher numbers at field margins, making a targeted spray possible. Scout to see where that line is.

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  • Heat and drought can cause flower abortion

    All parts of the Prairies had at least one day with a high of at least 28°C over the past week. Some areas were much hotter for days in a row.

    Hot days (28-30°C and up) and warm nights (16°C and up) from bud to mid-flowering stages can have a devastating effect on canola yield.

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  • Spraying a multi-staged crop

    Many canola crops have plants at multiple stages of growth. This field was reseeded due to frost, but some of the originals survived.

    Crop staging comes into play for herbicide, insecticide and fungicide timing. So crops with plants at various stages — some at flowering, some barely at the bud stage, for example — present a challenge when deciding when to spray.

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  • Sclerotinia risk: How low is it?

    Moisture is the key risk factor for sclerotinia stem rot. Without moisture before, during and after flowering, disease severity and the return on investment from fungicide will be lower than if moisture is present all through these periods. Moisture can come as rain, dew and/or humidity above 80%.

    This shows general sclerotinia stem rot incidence across Saskatchewan along with a general description of the moisture situation. There can still be pockets of higher incidence in years when most of the province is dry. Source: Saskatchewan Ministry of Agriculture

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  • 10%, 20% and 50% flower

    Sclerotinia stem rot and cabbage seedpod weevil control timing depends on flowering stage. This article will help you estimate 10%, 20% and 50% flower.

    Canola at 20% flower. Source: NDSU

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  • Canola Research Hub — video tutorial

    A new video tutorial for the Canola Research Hub is up and running. The video gives a quick introduction to the site and how to use it. Research is continually being added to the hub. Take some time and check out its features.

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  • Hail at flowering

    Yield loss will be lower if hail hits before flowering than at late flowering. Source: Canola Growers Manual

    Canola is quite resilient to light hail at up to 20% flower. The crop can flower longer to compensate, and may recover with only minimal to moderate yield loss. Canola has also shown remarkable recovery from more intense hail at 20% flower. However, a crop flattened by hail is unlikely to recover. If regrowth occurs, which is possible, plants are set back so far that maturity becomes a major factor.

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