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Sclerotinia Incidence Map: Annual Saskatchewan Canola Disease Survey

A total of 212 canola (Brassica napus) fields were surveyed in the major canola production regions of Saskatchewan in 2021. The survey covered the northwest (29 fields), northeast (38 fields), west-central (33 fields), east-central (51 fields), southwest (31 fields) and southeast (30 fields) areas of the province. Due to random field selection, not every rural municipality (RM) was surveyed in each region, while multiple fields were surveyed in some RMs.

Disease assessments were made in each field by collecting 20 plants from five different sites, each at least 20 meters from the edge of the field. Sclerotinia stem rot (Sclerotinia sclerotiorum) was observed in 35 per cent of the crops surveyed. Average incidence across all crops surveyed in the province was two per cent (six per cent incidence in infected crops). The overall mean incidence for the province was much lower than in 2020 (17 per cent) and 2019 (13 per cent). Lower disease incidence in 2021 can be attributed to the severe drought. Ultimately, the weather during this upcoming growing season may be the largest determining factor on disease levels in 2022.

2021 Sclerotinia Incidence Map

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