Vineyard & Orchard Development Specialists
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Cause: Erysiphe necator (formerly Uncinula necator), a fungal disease common to all areas of the PNW. The disease tends to be more severe on the westside of the Cascades but is a chronic problem in arid districts where over-the-canopy irrigation
Source: http://ipmnet.org/plant-disease/disease.cfm?RecordID=525
Here is a PDF from Cornell University about Black Rot Grape Disease.
Introduction
Black rot is an important fungal disease of grapes that originated in eastern North America, but which now occurs in portions of Europe, South A
Source: http://www.nysipm.cornell.edu/factsheets/grapes/diseases/grape_br.pdf
See the link for a list of Grape Plant Diseases:
* 1 Bacterial diseases
* 2 Fungal diseases
* 3 Miscellaneous diseases and disorders
* 4 Nematodes, parasitic
* 5 Virus and viruslike diseases
California Grape Pest Management Guidelines
University of California resource website for California Grape Pest Management:
Source: http://www.ipm.ucdavis.edu/PMG/selectnewpest.grapes.html
Six Most Common Grape Diseases
The six most common diseases of grapes are black rot, downy mildew, powdery mildew, dead arm, crown gall, and gray mold. Other diseases that may occur are anthracnose and those caused by nematodes and viruses. Grape disease control program
Source: http://www.wvu.edu/~exten/infores/pubs/pest/pcerti7.pdf