powdery mildew (Erysiphe betae) in Southern Plant Diagnostic Network

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sugar beet infected with powdery mildew under greenhouse conditions

Oliver T. Neher, The Amalgamated Sugar Company, Bugwood.org

sugar beet infected with powdery mildew under greenhouse conditions

Sugar beet plants showing signs of infection with powdery mildew (<em>Erysiphe polygoni</em>).

Howard F. Schwartz, Colorado State University, Bugwood.org

Sugar beet plants showing signs of infection with powdery mildew (Erysiphe polygoni).

Underside of leaf showing powdery mildew of sugar beet caused by <em>Erysiphe polygoni. </em>March 1995

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

Underside of leaf showing powdery mildew of sugar beet caused by Erysiphe polygoni. March 1995

Close-up of underside of leaf showing powdery mildew caused by <em>Erysiphe polygoni. </em>March 1995

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

Close-up of underside of leaf showing powdery mildew caused by Erysiphe polygoni. March 1995

Sugar beet leaf showing powdery mildew caused by <em>Erysiphe polygoni. </em>March 1995

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

Sugar beet leaf showing powdery mildew caused by Erysiphe polygoni. March 1995

Sugar beet leaf showing powdery mildew caused by <em>Erysiphe polygoni. </em>Note the chlorosis associated with the disease. March 1995

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

Sugar beet leaf showing powdery mildew caused by Erysiphe polygoni. Note the chlorosis associated with the disease. March 1995

Leaves of sugar beets showing symptoms of powdery mildew (<em>Erysiphe polygoni</em>).

William M. Brown Jr., Bugwood.org

Leaves of sugar beets showing symptoms of powdery mildew (Erysiphe polygoni).

Sugar beet plants showing signs of infection with powdery mildew (<em>Erysiphe polygoni</em>).

Howard F. Schwartz, Colorado State University, Bugwood.org

Sugar beet plants showing signs of infection with powdery mildew (Erysiphe polygoni).

Sugar beet plants showing signs of infection with powdery mildew (<em>Erysiphe polygoni</em>).

Howard F. Schwartz, Colorado State University, Bugwood.org

Sugar beet plants showing signs of infection with powdery mildew (Erysiphe polygoni).

Leaves of sugar beets showing signs of powdery mildew (<em>Erysiphe polygoni</em>).

Howard F. Schwartz, Colorado State University, Bugwood.org

Leaves of sugar beets showing signs of powdery mildew (Erysiphe polygoni).

Leaves of sugar beets showing signs of powdery mildew (<em>Erysiphe polygoni</em>).

Howard F. Schwartz, Colorado State University, Bugwood.org

Leaves of sugar beets showing signs of powdery mildew (Erysiphe polygoni).

Sugar beet leaf showing signs of powdery mildew (<em>Erysiphe polygoni</em>).

Howard F. Schwartz, Colorado State University, Bugwood.org

Sugar beet leaf showing signs of powdery mildew (Erysiphe polygoni).

Powdery mildew (<em>Erysiphe polygoni</em>) infection of bean plants in a field in Colombia.

Howard F. Schwartz, Colorado State University, Bugwood.org

Powdery mildew (Erysiphe polygoni) infection of bean plants in a field in Colombia.

Powdery mildew (<em>Erysiphe polygoni</em>) infection of bean plants in a field in Colombia.

Howard F. Schwartz, Colorado State University, Bugwood.org

Powdery mildew (Erysiphe polygoni) infection of bean plants in a field in Colombia.

Powdery mildew (<em>Erysiphe polygoni</em>) infection of bean pods in a field in Colombia.

Howard F. Schwartz, Colorado State University, Bugwood.org

Powdery mildew (Erysiphe polygoni) infection of bean pods in a field in Colombia.

Powdery mildew of Gerbera

O.P. Sharma, Bugwood.org

Powdery mildew of Gerbera

scouting for powdery mildew on sugar beet, leave rolled over finger for better visualization of mycelium patch

Oliver T. Neher, The Amalgamated Sugar Company, Bugwood.org

scouting for powdery mildew on sugar beet, leave rolled over finger for better visualization of mycelium patch

close-up of cleistothecia of powdery mildew of sugar beet

Oliver T. Neher, The Amalgamated Sugar Company, Bugwood.org

close-up of cleistothecia of powdery mildew of sugar beet

close-up of mycelium patch of powdery mildew of sugar beet showing conidiophores

Oliver T. Neher, The Amalgamated Sugar Company, Bugwood.org

close-up of mycelium patch of powdery mildew of sugar beet showing conidiophores

older sugar beet leave heavily infected with powdery mildew

Oliver T. Neher, The Amalgamated Sugar Company, Bugwood.org

older sugar beet leave heavily infected with powdery mildew