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