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Erysiphales - http://en.wikipedia.org/wiki/Erysiphales
Wikipedia article on the ascomycete fungi that cause powdery mildew on plants.
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Powdery Mildew Diseases - http://plant-disease.ippc.orst.edu/articles.cfm?article_id=30
Article with a description of the pathogens of the order Erysiphales causing these diseases, their diagnosis, epidemiology and control.
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Powdery Mildew - http://www.hgca.com/hgca/wde/diseases/Mildew/Milhost.html
Photographs and information on Blumeria graminis which can cause serious damage to oats, barley, rye and wheat.
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Powdery Mildew of Grass - http://www.uoguelph.ca/~gbarron/MISC2003/erysiphe.htm
Erysiphe graminis is an epiparasite on grass blades. This and other mildews are a very successful group of fungal parasites that attack numerous plants. Photographs and information.
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Microsphaera alni - http://www.apsnet.org/online/Archive/1998/sem17.htm
Microscopic image of a section of a cleistothecium.
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Uncinula necator - http://www.apsnet.org/online/Archive/1999/necator.htm
Scanning electron microscope images showing tissues infected with this pathogen before and after treatment with a fungicide.
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