Blackleg can result in girdling cankers on the plant stem near the soil line.
Recent growing seasons have had increased incidents of blackleg. Management for blackleg includes selecting varieties that are resistant or moderately resistant to this disease. The following management steps also should be considered:
- ROTATION. Rotation is very important in keeping disease inoculum levels low. Adhering to a four-year rotation is one of the best options for managing blackleg. Shorter intervals between canola crops can cause an increase in blackleg potential.
- TILLAGE PRACTICES. Tillage practices that keep more crop residue near the surface can contribute to increased disease pressure, particularly during wet springs.
- WEATHER CONDITIONS. Even with resistant or moderately resistant canola varieties, early cool, moist weather patterns can cause blackleg spores to germinate, which can lead to canola plant girdling or result in visible signs of infection.
All CROPLAN® varieties meet or exceed crop insurance requirements for blackleg tolerance.