February 5, 2025

QUIZ – Disease survey results

Three questions on canola disease ratings for blackleg, aster yellows and verticillium stripe, with reference to official disease surveys from 2024.

1. These blackleg-infested canola stems are from Alberta in 2024. What is the average disease rating for these infected stems? 

Blackleg infection on canola stems
2. The Saskatchewan canola field survey of 2024 found aster yellows in 71 per cent of fields surveyed. What was the average incidence (number of plants showing infection, on a per cent basis) for all fields surveyed? 
3. In the official Manitoba 2024 survey, surveyors found sclerotinia stem rot in 57 per cent of fields (prevalence) with an average incidence (plants with disease) in the infested fields of 8 per cent. What was the prevalence and incidence of verticillium stripe in Manitoba in 2024, according to the survey?

 

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