Mildew (Powdery)

Powdery mildew is a plant disease caused by many fungal species such as Podosphaera, Microsphaera, and Uncinula. It is a powdery growth on the surface of leaves, fruits, flowers, buds, and shoots, of plants, trees, grass, weeds, crops, and shrubs. Powdery mildew appears white because of its large number of spores, or conidia. A new conidium gets produced every 3 to 15 days.

If the disease is severe, the leaves may fall, flowering may get reduced, and the quality and quantity of fruits will be drastically decreased. The powdery mildew usually gives blisters to the young leaves and gives the leaves curls. If the disease progresses, the infected leaves may become white due to the powdery layer of the mildew. If the disease progresses even more, the leaves may turn brown and fall from the plant. If powdery mildew affects buds, then they never open.

Methods for avoiding powdery mildew include:

  • Consistent pruning, which can improve air circulation
  • The use of organic fertilizer
  • Not composting the deceased plant’s debris after harvest
  • Cleaning up the ground after the fall of the plant’s debris
  • Watering in the morning to help plants stay dry throughout the day.