Sow clean seed. Rotate out of canola at least 3 years. Early swathing may reduce seed loss. Control volunteer canola and cruciferous weeds. Plants are stunted.
Leaves become red and deformed.
Infected pods are blue in color, deformed and sterile. Infected plants are usually scattered throughout the field. The pathogen is carried by several species of leafhoppers. Control is based on reducing vector populations in the crop and in nearby weeds. Blackleg Leptosphaeria maculans 1.