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Thresholds for major canola insects
…insects Bertha armyworm: Bertha thresholds are based on work by Bracken and Bucher, published in the Journal of Economic Entomology in 1977. They found that each bertha armyworm larvae per…
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Questions of the Month
…south. Green worms found feeding on canola were alfalfa loopers, not bertha armyworm. Saskatchewan: Grasshoppers exhibited localized heavy pressure. Aster leafhoppers (vector of aster yellows) were more numerous and had…
Read moreTopics for July 21, 2021
…the Pests and Predators Field Guide is a recommended resource. Bertha armyworm under control Bertha armyworm is one of the most worrisome insect pests of canola, having caused severe infestations…
Read morePod eaters: Scouting tips and thresholds
…most common pod feeders in canola in Western Canada. Bertha armyworm. Credit: Justine Cornelsen Bertha armyworm Berthas come in brown, black and green shades. The green berthas are shinier than…
Read moreQuestions of the Week
…down in the canopy. (Thresholds for major canola insects) (Insect scouting how to) Diamondback moths are being reported across the Prairies, though not yet in large numbers. Bertha armyworm reports…
Read moreThresholds: Insect management tools
…insects Bertha armyworm: Bertha thresholds are based on work by Bracken and Bucher, published in the Journal of Economic Entomology in 1977. They found that each bertha armyworm larvae per…
Read moreInsect update: Lygus, berthas and more
…interactions. The white spot on the back of this bertha armyworm is a tachinid fly egg. This is a natural parasitoid of bertha armyworm. Photo credit: Shelley Barkley Grasshoppers. Populations…
Read moreInsect update
…canola pods. The others are lygus and bertha armyworm. Read more Further reading: AAFC Insect Field Guide Prairie Pest Monitoring Network: Bertha armyworm scouting tips Field Heroes bertha armyworm guide…
Read moreBertha spraying and pre-harvest intervals
A full-fledged bertha armyworm outbreak continues in the Peace region. Continue scouting, noting that fields at thresholds can be right beside fields with low counts. See scouting tips and threshold…
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