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Use of Petroleum Derived Spray Oils in Washington Grapevine Powdery Mildew Management Programs

G. G. Grove, J. Lunden, and S. Spayd

March 2005


The effects of petroleum-derived spray oils (PDSO) on powdery mildew control and berry characteristics were evaluated in vineyards in Washington. Up to seven PDSO applications were made during the growing season. PDSO were also used as the initial treatment in fungicide treatment sequences upon first detection of powdery mildew signs in the vineyard. PDSO helped to reduce fungicide usage and input costs without compromising disease control.


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