• Insect update: diamondback, weevil, cutworm, bertha, beneficials

    June 27, 2012

    Probably too early to spray cabbage seedpod weevil, diamondback continue feeding, bertha moth numbers are high in some regions, cutworms near the end but still active, and always think about those valuable beneficials — like those helpful killers, the lady bugs…

  • Station 3: Lygus and its natural enemies

    March 9, 2012

    Our current economic threshold tables for lygus in canola may be too low when applied to current canola production systems across the Prairies. If the stand is healthy and growing fast, growers are reportedly doubling or tripling thresholds. There is no data to support this, but future research needs to reexamine the thresholds with respect to our newer varieties of…

  • Lygus – race between insect and crop development

    August 17, 2011

    Quite high populations of lygus are being found in parts of the Peace and southern and central Alberta (finding as many as 80 lygus per 10 sweeps with approximately 25 to 30% of those being adults with the remainder a range of instar stages). Sweep net results also seem to be variable…

  • Which worm is it: bertha, diamondback or cabbage?

    August 10, 2011

    Before spraying, make sure the worms feeding on your canola are actually the species you think they are. Bertha armyworm, diamondback moth larvae and cabbageworms can be confused. Here's how to tell the difference:…

  • How to sweep net properly

    August 10, 2011

    Thresholds for lygus bugs and cabbage seedpod weevil, for example, are based on a specific sweep net technique. If you’re not doing a complete 180° pattern, walking while you sweep, and keeping the net near the top of the canopy, your counts could be significantly different from someone using the recommended techniques…

  • Insect update

    August 4, 2011

    Growers in some areas are spraying for late season insects, including lygus, bertha armyworm and diamondback moth. Make sure to scout…

  • Insect update: Lygus bugs and cabbage seedpod weevil

    June 29, 2011

    Lygus bugs are feeding on canola in the Peace River region and in some parts of central Alberta. Insecticide control at the bud stage is rarely effective or economical. Under good growing conditions, canola can grow through this early damage without any yield loss. Instead of spraying, step up monitoring and proper sweep net sampling and be ready to take…

  • Lygus threat minimal at bud stage

    June 27, 2011

    Insecticide to stop lygus bugs from feeding on canola at the bud stage is rarely effective or economical. Under good growing conditions, canola can grow through this early damage without any yield loss. Instead of spraying, step up monitoring and proper sweep net sampling and be ready to take action at the pod stage if necessary…

  • Insect update

    June 22, 2011

    Flea beetle spraying continues in Manitoba where crops are advancing slowly due to excess rain and limited warmth. Redbacked cutworms are still causing severe damage in southern Alberta. Some sprayed fields need to be reseeded…

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