Destroy residues after harvest. Spray or dust plants when rust appears and repeat at seven-day intervals. Pre-emergence death of seeds. Sclerotinia sclerotiorum 1. Young plants have watery, soft lesions near cotyledonary node.
Older plants have soft lesions on stems, petioles, leaves or pods.
White mat-like mycelium develops in older, rotted tissues. Plant in well-drained soils not recently used for beans, potatoes, tomatoes, lettuce or cabbage. For snap beans only. Apply fungicide 25 percent to 50 percent bloom and repeat at peak bloom. Symptoms vary with virus and varieties.