Insects

  • Insect update: The biggies plus clover cutworms and little red bugs

    Insects

    Clover cutworm damage has been confirmed in a few fields around Weyburn, Saskatchewan. They are a climbing cutworm and can be easily confused with bertha armyworm. The most distinct difference between the two species is the wide stripe along each side; it is yellowish pink on clover cutworm and yellowish orange on bertha armyworm.

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  • Cutworms heavy in canola on canola

    Insects

    Two CCC agronomy specialists heard this week of high cutworm damage in canola fields seeded into canola stubble. Canola on canola has many potential yield risks and we can add heavy cutworm feeding to that list.

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  • Map of the Week – CSPW

    Insects

    With earliest canola fields starting to flower in southern Alberta and southwest Saskatchewan, cabbage seedpod weevil scouting season begins. Here is the forecast map for 2018 based on 2017 surveys.

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  • Cabbage seedpod weevil: Early fields at highest risk

    Insects

    Earliest canola fields are just coming into flower in southern Alberta and southwest Saskatchewan, the highest-risk areas for cabbage seedpod weevil in Western Canada. Cabbage seedpod weevils tend to cluster in fields that are first to flower, so farmers with early fields will want to check them closely.

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  • Map of the Week – Bertha armyworm

    Insects

    Growing degree days across most of the Prairies have reached the threshold for adult bertha armyworm (moth) emergence from overwintering pupae. That is 7-10 days ahead of normal. Egg laying begins shortly after adult emergence and young worms emerge about a week after that. Based on 2017 results, 2018 is not expected to be a bad year, but local flare-ups can occur.

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  • Scouting 7 to 21 days after seeding: What to look for?

    Insects

    With warm soils, decent moisture and 1” seeding depth, emergence can occur about a week after seeding. If emergence is slow or patchy, scout to find out why. The first 21 days are critical to a successful canola crop.

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  • Reader question: Will plants survive flea beetle stem feeding?

    Insects

    If the tissue underneath the bite is still living, the seedling will likely survive as long as (1) the stem can still bear the weight of the cotyledons and first leaves, (2) the stem is not to subjected to more feeding, and (3) weather conditions are good for plant growth.

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  • Cutworms: Timely scouting and spray decisions

    Insects

    Include cutworms on the scouting checklist for the first one to three weeks after emergence. Any later and management becomes more difficult because (i) spraying a registered insecticide is useless because the cutworms have developed beyond the feeding stage, and/or (ii) reseeding options are starting to be limited.

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  • Tank mixes of herbicides and insecticides or fungicides

    Insects

    Sprayer in canola Cheri Jacobsen small

    Combining pest control operations to save trips over the field may seem like good economic sense, but consider the following when making this decision:

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  • Timely cutworm scouting and spray decisions

    Insects

    See bare patches like this? Could be cutworms. Include cutworms on the scouting checklist for the first one to three weeks after emergence. Any later and management becomes more difficult because (i) spraying a registered insecticide is useless because the cutworms have developed beyond the feeding stage, and/or (ii) reseeding options are starting to be limited.

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  • Canola Watch quiz – Cutworm

    Insects

    Test your cutworm knowledge with these four questions, including a “dry soils” angle.

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  • Map of the Week – wind trajectories

    Insects

    Of particular interest are those trajectories that, prior to their arrival in Canada, originated over northwestern and southern USA and Mexico – anywhere diamondback moth populations overwinter and adults are actively migrating.

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  • Quick note on spraying flea beetles in hot weather

    Insects

    Synthetic pyrethroids (Decis, Matador/Silencer, for examples) benefit from late-day spraying because they should be applied when temperatures are below 25°C.

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  • Canola Watch quiz – Flea beetle theme

    Insects

    Test your flea beetle knowledge with these five questions.

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  • Help with insect surveys for 2018

    Insects

    Alberta, Saskatchewan and Manitoba will be doing bertha armyworm and diamondback moth surveys again in 2018. To put up a trap and help with the monitoring program (including trap checking), please contact your provincial entomologist:

    Alberta: Email Shelley Barkley at Shelley.Barkley@gov.ab.ca or Scott Meers at Scott.Meers@gov.ab.ca
    Saskatchewan: Email James Tansey at james.tansey@gov.sk.ca.
    Manitoba: Email John Gavloski at john.Gavloski@gov.mb.ca.

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