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Evaluation of Fungicides for Management of Blackleg Disease on Canola and QoI-fungicide Resistance in Leptosphaeria maculans in Western Canada

Blackleg, caused by the fungus Leptosphaeria maculans, is one of the most important diseases on canola in western Canada. Severe epidemics can cause substantial losses of seed yields and quality. Fungicide application is an important disease management strategy, but little is known about the efficacy of fungicides against blackleg and possible impact on fungicide sensitivity of L. maculans after repeated uses. The results of present study showed that fungicides generally reduced the blackleg incidence and severity on the susceptible canola cultivar, and the QoI fungicides were more effective than the DMI fungicides. Early fungicide application at about 2-4 leaf stage provided a small yield improvement on the susceptible cultivar. Typical point mutation was not found in any of these QoI-insensitive L. maculans field isolates and polymorphism correlating with the QoI-insensitive phenotype was not observed either in the sequence of cytochrome b gene among the L. maculans isolates.
Date22 August 2014
CreatorsLiu, Chang
ContributorsFernando, Dilantha (Plant Science), Gan, Yantai (Plant Science) Tenuta, Mario (Soil Science)
Source SetsUniversity of Manitoba Canada
Detected LanguageEnglish

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