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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…
Cabbage seedpod weevil
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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… -
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… -
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… -
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… -
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 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… -
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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