Etiology:

• The macro conidia are 1-5 sepatae, hyaline, thin walled, linear to falcate.
• The tapering micro conidia are hyaline, thin elliptical to spherical , single or two celled.
• Also produces chlamydospores ( dark and thicken )
• Inter and intracellular growth.
  

Favorable condition:

• Hot and dry periods followed by rains.
• Heavy black soils with an alkaline reaction.
• Increased doses of nitrogen and phosphatic fertilizers.
• Wide range of temperature; 10 to 35°C but grows well at 18- 27°C.
• Humidity: > 75%
• Soil pH=5.3