July 15, 2015 – Issue 17

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  • July 15 Quiz — Sclerotinia stem rot risk

    At this stage of the season, severe stem infection will start to look like this. Source: Debbie McLaren, AAFC

    This quiz can help you assess the sclerotinia stem rot risk in canola fields.

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  • Podcast: Keith Downey on the International Rapeseed Congress

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  • Sclerotinia cycle and spray timing

    The timing is right for fungicide, but this field is thin (you can still see ground between the rows) and the soils are dry. Credit: Amanda Wuchner

    Scattered rain with more in the forecast will have growers wondering this week whether to spray fungicide to manage sclerotinia stem rot. Moisture is the key risk factor for sclerotinia stem rot. Without moisture a couple of weeks before flowering and humidity 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.

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  • Insect Update: Lygus timing and thresholds, Grasshoppers, Blister beetles

    You might be seeing more root maggots this year, but they're not really something that can be controlled in crop.

    Lots of insects are being reported, but agronomists and growers are generally doing a good job of assessing the economic threat and determining that most situations this week do not require a spray. Given the patchy nature of most insect patterns, all fields should be checked. If something is spotted that may be above thresholds, check a few areas of the field before making the final decision.

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  • Keep it Clean, keep the customer happy

    Canada exports 90% of the canola we produce, and our global customers won’t accept anything less than squeaky-clean seed. This time of year, the keys are to ensure a crop protection product applied won’t cause concern for canola exporters, and to know a product’s required interval between application and swathing.

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  • Insect thresholds: Quick review

    Bertha armyworm thresholds
    Lygus bug thresholds small

    While insects are not a major threat in most fields at this point in 2014, diamondback moth larvae are around, cabbage seedpod weevil are still laying eggs, and bertha armyworm larvae have been found in some locations — although at very low levels for the most part. (See the Map of the Week.) Here is a review of thresholds for the four major insects found in canola at this stage of the season…

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  • Heat blast and 6 other causes for missing pods

    Heat injury to pods.

    As canola starts to move from flowering and into pod formation, growers will often notice blanks up the raceme where pods did not form. Here are 7 possible reasons.

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