Cabbage seedpod weevil

  • Insect update: Bertha, diamondback and weevil counts

    Cabbage seedpod weevil

    Insect trap counts are generally low across the Prairies, but bertha counts keep rising. Here are the latest provincial survey results.

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  • Map of the Week – Cabbage seedpod weevil counts

    Cabbage seedpod weevil

    Alberta Agriculture’s cabbage seedpod weevil survey results for 2018 are mapped. In areas with a red marker, 25% or more of samples reported are above the threshold.

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  • Map of the Week – CSPW

    Cabbage seedpod weevil

    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

    Cabbage seedpod weevil

    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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  • How to count 10-50% flower

    Cabbage seedpod weevil

    Canola at 20% flower. Source: NDSU

    As a rough estimate, the 20% flower or “bloom” stage is when the main stem has around 15 “flowers”. Canola can reach 20% bloom in 4-5 days after first flower.

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  • Cabbage seedpod weevil: Scouting and spray timing

    Cabbage seedpod weevil

    Cabbage seedpod weevils move to canola fields at the bud to early-flower stages. While they will feed on buds and destroy some of them, spraying is rarely recommended before 10% bloom.

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  • How to count 10%, 20% and 50% flower

    Cabbage seedpod weevil

    Use these descriptions to identify key flowering stages for sclerotinia stem rot and cabbage seedpod weevil management.

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  • Insect scouting: What may you find?

    Cabbage seedpod weevil

    Lygus bugs make an appearance at canolaPALOOZA.

    Lygus is one insect you may find in canola this week, but spraying lygus before pod stages rarely provides an economic benefit. Lygus do most of their damage at the pod stages.

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  • Early flower is weevil time

    Cabbage seedpod weevil

    Cabbage seedpod weevil. Credit: S.J.Barkley, Alberta Agriculture and Forestry

    Keys to the spray decision are scouting and timing. The economic threshold is 20 CSPW per 10 sweeps generally across the field. If weevils are at thresholds, the time to spray is at 10-20% bloom, just as first pods reach 3/4” long.

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  • Cabbage seedpod weevil: When to spray

    Cabbage seedpod weevil

    Cabbage seedpod weevil on canola buds. Credit: Brooke Moon

    Cabbage seedpod weevils are attracted to the buds on early canola plants, as shown in this Brooke Moon photo. While they will feed on these buds and destroy some of them, spraying is rarely recommended before 10% bloom.

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  • How to identify your weevils

    Cabbage seedpod weevil

    Cabbage seedpod weevil. Credit: S.J.Barkley, Alberta Agriculture and Forestry
    Pea leaf weevil. Credit: S.J.Barkley, Alberta Agriculture and Forestry

    Pea leaf weevils (bottom) can be found in canola but the only weevil of concern is the cabbage seedpod weevil (top). Thank you Shelley Barkley of AAF for the excellent photos.

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  • Insect review: 3 podcasts and a tiny survey

    Cabbage seedpod weevil

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  • Insect update: Grasshoppers, lygus, cabbage seedpod weevil

    Cabbage seedpod weevil

    grasshopper feeding small

    Grasshoppers may be above thresholds in some fields. The nominal threshold for grasshoppers in canola is 8-12 per square metre, although the higher end of that range may be more appropriate in a typical canola crop. Grasshoppers are often at higher numbers at field margins, making a targeted spray possible. Scout to see where that line is.

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  • 10%, 20% and 50% flower

    Cabbage seedpod weevil

    Sclerotinia stem rot and cabbage seedpod weevil control timing depends on flowering stage. This article will help you estimate 10%, 20% and 50% flower.

    Canola at 20% flower. Source: NDSU

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  • Insecticides for variable staged crops

    Cabbage seedpod weevil

    Cabbage seedpod weevils can arrive early, but this is still too early to spray.

    Cabbage seedpod weevils are one example of an insect where crop stage is a factor in the management decision. Weevils lay their eggs in developing pods, and these larvae feed on canola seeds inside the pods. The rule of thumb is pods less than 3/4” are too small for egg laying. If some plants are forming pods and the rest are still bolting, waiting will improve overall spray timing and return on investment.

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