Tan or brown colored leaf spots are formed on leaf surfaces. Stem lesions can also be found and are gray or black in color. Pods and seed may also become infected. Infected seed may appear gray and have a shriveled appearance. Infected pods have a tendency to split open resulting in seed loss.
Effective control measures for Blackleg in canola include:
Blackleg testing for the virulent strain is conducted by the department. An agar test is performed using 1,000 seed. This test is typically completed in seven days and results are reported as a percentage of infected seed.