There are few plant diseases that have the combination of international distribution and importance. Grapevine powdery mildew is one such disease, and is present in almost all international viticulture areas where susceptible grape varieties are produced. This disease is predominately driven by weather and canopy microclimate conditions, and has a histroy of fungicide resistance development. Because of this, understanding it's biology and management is critical in maintaining control in the vineyard.
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