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CINDY OCAMB REPORTS BLACKLEG CONTINUING TO SPREAD IN WILLAMETTE VALLEY

As reported in the Capital Press and the Plant Disease Management Handbook, the causal fungus can infect a range of cruciferous crops including broccoli, cabbage, canola, mustard, and radish.

Symptoms include roundish, gray spots on cotyledons, leaves, stems or petioles,  with black dots (pycnidia) on the surface, stem lesions, and root rot. Seed crops can become infected from inoculum splashed onto seed pods.

canola black leg

During rainy weather infection can spread very rapidly in a few weeks. Even with good management, it may take some time to get this disease under control.