powdery mildew.JPG

Powdery mildew

Area of impact: Most visible on leaves but can spread to all aboveground parts

Description: White powdery patches resembling cotton. Eventually these patches turn a dull gray sometimes with black specks.

Pathogen involved: Erysiphe graminis (a fungus)

Timing/Conditions: Cool, cloudy, damp weather is ideal for this disease.

Contributing factors: A dense lush crop canopy.

Management practices: Plant resistant varieties and avoid overly dense lush canopies by controlling planting rates and nitrogen application.

Similar Diseases

Ask an Agronomist

The material and content contained in the Greenbook label database is for general use information only. Agworld and Greenbook do not provide any guarantee or assurance that the information obtained through this service is accurate, current or correct, and are therefore not liable for any loss resulting, directly or indirectly, from reliance upon this service. This label database does not replace the official manufacture issued label. Users of this database must read and follow the actual product label affixed to the container before use of the product.