Powdery mildew

(Erysiphe polygoni)

Credits:Biovision-Infonet

A white powdery mould appears on the upper leaf surfaces. Severely diseased leaves turn yellow and die. Leaf petioles, stems and pods can also be affected.

What to do:

• Plough under bean debris after harvest.
• Practise a 2-3 year crop rotation without legumes.
• Avoid continuous bean cropping.