For control, start with disease-free plants. Prune and destroy cankered canes, sterilizing pruning tools between cuts. Keep plants in healthy condition. Spray as for black spot control. Protect plants during the winter.
Varieties differ in susceptibility.
Canker Dieback Rose canes turn dark brown or black and die progressively down the stem. Always remove the damaged part of the cane, then follow a regular spray or dust program. Avoid injury to canes, and use a sealer after pruning. Cut off galls with a sharp knife, disinfect with alcohol. Paint pruned area with mild bleach solution.