• It is an Oidiopsis type of powdery mildew in which the   mycelium is endophytic.
• The affected leaf shows powdery patches on the lower surface corresponding with yellowing   on the upper surface.
• Usually older l eaves show symptom first.
• There will be premature   defoliation of affected leaves.
• The disease is air borne

Yellowing on upper surface	Powdery growth on lower surface

Management

•  Spraying with Neem Seed Kernel Extract (NSKE) 5% or  Neem oil 3% twice at 10 days   intervals from initial disease appearance.
• Spray Carbendazim 1g/lit or Wettablesulphur 2.5g/lit.