Insects

  • Insect distribution maps for 2017 and forecast maps for 2018

    Insects

    Prairie Pest Monitoring Network (PPMN) regional maps for insect pests affecting canola are provided in this article.

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  • Reader question: Do bertha armyworms in 2017 indicate higher risk for 2018?

    Insects

    A reader from southeast of Saskatoon emailed this question: I had a field with bertha armyworms on the perimeter in 2017. Numbers were not quite enough to reach spray thresholds, but very close. (I likely should have sprayed the perimeter.) My plans are to seed the field next to it to canola this year. Will this second field likely have a bertha armyworm issue?

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  • Visit fieldheroes.ca to learn more about beneficials

    Insects

    The Field Heroes website shows how natural enemies can help manage insect pest populations. Scouting is still necessary because beneficial insects do not always keep pest damage below economic levels, but spraying without consideration for economic thresholds can hurt the farm bottomline and also cause unnecessary damage to these beneficial insects.

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  • Bertha armyworm: Hot pockets, scouting, rain

    Insects

    A heavily-infested field in western Manitoba (south of Riding Mountain National Park) generated a lot of interest on Twitter in the past week. It prompted a lot of scouting, which is good. But what this one field and the ensuing scouting demonstrated is that bertha armyworm population spikes can be highly localized.

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  • Canola Watch quiz: Diamondback moth

    Insects

    Test your diamondback management skills with these four questions…

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  • Diamondback moth larvae: Common questions

    Insects

    Diamondback moth larvae have been found in canola fields across the Prairies this year. Of those fields with the larvae, counts in many (perhaps most) are below and often well below thresholds. Some fields are at thresholds. Some fields seem to be well above thresholds. The key is to the check each field. Diamondback larvae can vary in number from field to field and even within areas of a field. (Photo credit: John Gavloski)

    Here are answers to common questions….

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  • Be on alert for bertha armyworms

    Insects

    Bertha armyworm adult moth counts were generally low across the Prairies in 2017. A few trap sites did enter the moderate risk level, but none was high. See provincial counts in the Prairie Pest Monitoring Network blog. However, as experienced with diamondback moth trap counts this year, egg survival could be higher in dry conditions and warm weather will promote rapid growth.

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  • Lygus thresholds: Dry vs Good conditions

    Insects

    Lygus. Credit: Dan Johnson

    In dry conditions, existing lygus threshold tables are still appropriate when making spray decisions. These tables indicate that if canola at the pod ripening stage is $12 per bushel and spray costs $12 per acre, the threshold is 11 lygus adults or late instar nymphs per 10 sweeps (~1 per sweep).

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  • Butterflies in canola

    Insects

    Butterflies have siphoning mouth parts, much like a straw. They are harmless to crops and may actually provide some pollination benefit. Butterfly larvae from these three species will feed on crops, but are not major pests of canola and rarely cause enough damage to warrant a spray.

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  • Keep watch for diamondback moth larvae

    Insects

    Diamondback moth larvae have been found in many fields this year. In most cases counts have been well below economic thresholds, but keep looking just in case. Some fields are at thresholds and a few have been sprayed.

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