NC State Extension

Powdery Mildew

Powdery Mildew Identification and Management

Powdery mildew causes white lesions on leaves and leaf sheaths. Glumes and awns also can be infected when disease is severe. Fungal growth is largely limited to outer plant surfaces and can be easily wiped away by rubbing a finger across affected areas. Mature lesions may have dark, reproductive structures mixed with the white, cottony growth of the fungus.

Management:
Variety resistance in 2014 and 2015, foliar fungicides.

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