The Biology And Management Of Canola Blackleg

Blackleg, also known as Phoma stem canker, is a destructive fungal disease of canola and other Brassica spp. caused by Phoma Iingam. lt has caused crop failures in canola/oilseed rape in Canada and Australia, and in Kentucky in the U.S. The disease was first found in Oklahoma in the fall of 2009 and apparently contributed to yield loss in some fields in North Central OK, alone or in combination with damage caused by the cabbage maggot. Because this is a new disease in Oklahoma, there is no local information on the damage potential of this disease or on effective strategies for disease control.

The proposed research on blackleg will have three objectives. The damage potential of black leg in Oklahoma will be assessed by inoculating field plots of susceptible and resistant canola varieties at crop development stages and measuring yield response. Secondly, a black leg nursery will be established where canola varieties and breeding lines will be screened for resistance to the disease.

Finally the effectiveness of fungicide application for managing black leg will be assessed. Different fungicides will be compared and various application timings will be assessed in artificially inoculated field plots. Results should provide canola growers practical information on the threat of black leg to local canola production and on effective disease control strategies.

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