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Scout for bertha armyworm, lygus bugs and diamondback moth larvae on pods, but only spray if insects counts are at or above economic thresholds. Try this quiz to brush up on thresholds…
Canola Watch quiz – Insect thresholds
July 26, 2018
Insects
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Grasshopper: Thresholds and scouting tips
July 26, 2018
The nominal threshold for canola is seven to 12 per square metre. This article provides tips on how to scout…
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Map of the Week – Bertha armyworm counts
July 19, 2018
A few hotspots with higher bertha armyworm moth counts are showing up in Alberta, Saskatchewan and Manitoba…
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Bertha armyworm: Thresholds
July 19, 2018
The economic threshold is the density of larvae where the economic value of the yield lost due to feeding equals the cost of control…
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Diamondback moth larvae observed
July 19, 2018
Diamondback moth larvae are at noticeable levels in many canola fields in the Eastern and southern Interlake areas of Manitoba. But levels are generally below the economic threshold…
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Insect update: Bertha, diamondback and weevil counts
July 11, 2018
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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Diamondback moth parasitoid in high numbers
July 11, 2018
Entomologists were excited to find a known diamondback moth parasitoid, the 2mm-long Diolcogaster claritibia wasp, at very high numbers in Alberta canola fields over the past couple of weeks…
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What’s going on with the roots?
July 11, 2018
Take a random look at a few canola roots in each field to see what's going on. Also dig up the root area for plants that look less than healthy for no apparent reason. This plant has foot rot…
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Map of the Week – Cabbage seedpod weevil counts
July 5, 2018
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…