Symptoms

• Leaves are covered with patches of a whitish to grayish powdery growth. This disease is caused by the fungusErysiphe polygonii.
• New growth appears contorted, curled or dwarfed and may turn yellow and drop. Pods are dwarfed and distorted.
• This is mostly a problem on fall beans. Powdery mildew is spread by wind and rain.

Management

• Avoid closer spacing by providing proper spacing between the crops.
• Remove and destroy all the debris after harvesting
• Avoid same cropping for 3 to 3 years in same area.
• When the disease is first noticed, sprays or dusts sulfur. Do not use sulfur on young plants.