July 27, 2016 – Issue 19

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  • Check suspicious weeds for herbicide resistance

    Kochia stands above the canola canopy. You might want to check them for glyphosate resistance. Source: Ian Epp

    Surviving weeds are growing strong and some of them — like kochia and wild oats — start to look really obvious by this time of year.

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  • Scouting those sickly patches

    Patches that seem to be maturing early while the rest of the crop is still green do warrant closer inspection. With all the rainfall in some areas, die-off due to excess moisture could be the prime suspect — but check anyway. It could be disease.

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  • Strong growth plus wind and pounding rain = lodging

    Lodged canola. This could still spring back up by harvest time. Credit: Warren Ward

    If it does not straighten up, the result can be higher levels of sclerotinia stem rot and harvest challenges.

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  • Harvest planning: Swath timing and straight cutting

    Seeds in this pod would be counted as colour changed.

    Some of the earliest canola fields will show seed colour change over the next two weeks. For those growers, we provide this short primer on swath timing and straight combining.

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  • Why so few insects this year?

    Pod-eating insects — including bertha armyworm, lygus and diamondback moth larvae — are at low levels in general in 2016. The biggest factors regulating insect populations are (1) weather, (2) natural enemies and (3) competing food sources. Each is working in favour of lower insect pest pressure this year.

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  • Curled pods are usually thrips damage

    Western flower thrips. Credit: Olds College

    Three thrips species will feed on canola in Canada and only one — western flower thrips, (Frankliniella occidentalis) — causes pod curling.

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  • 7 causes for missing 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: Heat. Hot days (28-30°C and up) and warm nights (16°C and up) from bud to mid-flowering stages can have a significant effect on canola yield. Cool […]

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  • Sclerotinia: Late or second applications

    Fungicide applied late in the window can provide valuable protection from sclerotinia stem rot if flowering is extended or if conditions become more conducive to disease.

    Heavy rains can increase the sclerotinia stem rot risk but they also make fields too wet for ground sprayers. This can delay timely applications, especially because demand for aerial applicators can make for long wait times. Here are scenarios that may help you work through this situation….

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