powdery mildew (Blumeria graminis) in Pests not Known to Occur in North America

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powdery mildew (<em>Blumeria graminis</em>) sign on barley (<em>Hordeum vulgare</em>)

Clemson University - USDA Cooperative Extension Slide Series , Bugwood.org

powdery mildew (Blumeria graminis) sign on barley (Hordeum vulgare)

powdery mildew (<em>Blumeria graminis</em>) sign on barley (<em>Hordeum vulgare</em>)

Clemson University - USDA Cooperative Extension Slide Series , Bugwood.org

powdery mildew (Blumeria graminis) sign on barley (Hordeum vulgare)

powdery mildew (<em>Blumeria graminis</em>) sign on barley (<em>Hordeum vulgare</em>)

Clemson University - USDA Cooperative Extension Slide Series , Bugwood.org

powdery mildew (Blumeria graminis) sign on barley (Hordeum vulgare)

powdery mildew (<em>Blumeria graminis</em>) sign

Clemson University - USDA Cooperative Extension Slide Series , Bugwood.org

powdery mildew (Blumeria graminis) sign

Powdery mildew on barley

Department of Plant Pathology , North Carolina State University, Bugwood.org

Powdery mildew on barley

powdery mildew (<em>Blumeria graminis</em>) sign on common wheat (<em>Triticum aestivum</em>)

Department of Plant Pathology , North Carolina State University, Bugwood.org

powdery mildew (Blumeria graminis) sign on common wheat (Triticum aestivum)

powdery mildew (<em>Blumeria graminis</em>) sign on common wheat (<em>Triticum aestivum</em>)

Department of Plant Pathology , North Carolina State University, Bugwood.org

powdery mildew (Blumeria graminis) sign on common wheat (Triticum aestivum)

Powdery mildew wheat. May 1997

Gerald Holmes, Strawberry Center, Cal Poly San Luis Obispo, Bugwood.org

Powdery mildew wheat. May 1997

Powdery mildew on wheat. Note the tiny black cleistothecia nested inside some of the patches of mycelium. May 1997

Gerald Holmes, Strawberry Center, Cal Poly San Luis Obispo, Bugwood.org

Powdery mildew on wheat. Note the tiny black cleistothecia nested inside some of the patches of mycelium. May 1997

powdery mildew (<em>Blumeria graminis</em>) symptoms on wheat (<em>Triticum spp.</em>)

Erik Stromberg, Virginia Polytechnic Institute and State University, Bugwood.org

powdery mildew (Blumeria graminis) symptoms on wheat (Triticum spp.)

Powdery mildew on blades

Elizabeth Bush, Virginia Polytechnic Institute and State University, Bugwood.org

Powdery mildew on blades

Powdery mildew on blades

Elizabeth Bush, Virginia Polytechnic Institute and State University, Bugwood.org

Powdery mildew on blades