Seed from diseased areas should be treated with a seed treatment containing a fungicide. Resistant varieties of canola are available. The use of moderately susceptible or moderately resistant varieties may give low levels of blackleg. However, the use of susceptible varieties will likely give high levels of blackleg. Most new Argentine canola varieties are moderately resistant or resistant.
All Polish varieties are susceptible.
Check your provincial seed guide for a listing of the varieties available and their susceptibility to blackleg. Incorporate infected stubble after harvest. Blackleg survives in slowly decomposing canola stubble. A 4-year rotation between canola crops is recommended once blackleg has been detected in a field. Control volunteer canola and wild mustard in other crops.