What are the reasons for occurrence of powdery mildew ?
Powdery mildew is caused by the fungal pathogen Phyllactinia corylea and is more common in temperate region. In tropics, it is common during winter and rainy season. Temperature 22-26C and RH of 60-70% favour the spread of disease. The disease is characterized by white powdery patches on the lower surface of the leaves in the beginning. As the disease advances, the patches spread to the entire leaf surface and turn to blackish brown in colour.
