Symptoms

• This fungal disease, caused by Cercospora species, occurs primarily on the lower leaves of plants as irregular, tan spots.
• Severe infection causes excessive leaf drop and stunting of the plant. Infection is worse during periods of extended rainfall, high humidity and temperatures between 75 to 85° F.

Management

• Use disease-free seed for planting. Remove all debris in the garden after harvest.
• Do not plant beans in the same area for two to three years. There are no resistant varieties or recommended chemicals for this disease in the home garden.