Application of foliar fungicides at the 2 to 4 leaf stage reduced blackleg disease incidence and severity, and improved yield on the susceptible Westar canola cultivar. On two resistant cultivars, however, this fungicide treatment reduced the disease but showed no yield benefit. Since resistant canola...

Yield losses increased from 18% to 99% in the hybrid canola ‘73-15RR’ and 26% to 86% in hybrid ‘1950RR’ when disease severity rose from 2 to 5 compared with plants with severities of 0–1. Understanding the yield loss relationship with blackleg severity will help agronomists...

SaskCanola administered Growing Forward 2-funded blackleg research projects that concluded over the past year or so. Results from these studies make it possible for farmers to test for the predominant blackleg races in a field and use this information to make strategic decisions for the...

Several fungicides were evaluated for control of cotyledon infection by Leptosphaeria maculans and blackleg disease of canola. Under controlled environmental conditions, fluopyram showed greater efficacy than fluquinconazole in limiting cotyledon infection, while regular seed treatments with Prosper EverGold or Helix Vibrance were ineffective. In field...

For every 1-unit increase in disease severity rating on a scale of 1 to 5, yield loss in a susceptible variety was 17.2% and pod loss was 13.0%. Disease severity was lower and seed yield was 120% to 128% higher in the moderately resistant to...