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The effects of petroleum-derived spray oils (PDSO) on powdery mildew control and selected berry characteristics were evaluated in vineyards in eastern Washington during 2001 and 2002. Up to seven PDSO applications were made during each growing season between the 15-to-30-cm shoot stage and veraison. The use of oil decreased total soluble solids (TSS) at harvest by 0.17% per application but had no significant effects on berry weight, pH, or titratable acidity. Because of their documented eradicant and antisporulant properties, PDSO were also utilized as the initial treatment in fungicide treatment sequences initiated upon the first visual detection of powdery mildew signs in the vineyard. When used in this fashion very early in powdery mildew epidemics, PDSO helped to reduce fungicide usage and input costs without compromising disease control.

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