Use western grown certified seed. Do not work in garden when plants are wet. Spray copper fungicides at weekly intervals. Water-soaked or light green areas on leaves. Centers of spots become brown, dry and brittle.
Pods have water-soaked lesion spots that enlarge into broad, irregular blotches.
Use western grown certified seed. Plow to bury crop residue. Clean equipment between fields. Do not work among plants when wet. Use treated seed.