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Am. J. Enol. Vitic. 49:1:11-16 (1998)
Copyright © 1998 by the American Society for Enology and Viticulture.
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The Efficacy of JMS Stylet-Oil on Grape Powdery Mildew and Botrytis Bunch Rot and Effects on Fermentation

K. J. Dell 1, W. D. Gubler 1, R. Krueger 1, M. Sanger 1, and L. J. Bettiga 2

1 Department of Plant Pathology, University of California, Davis, 95616
2 University of California Cooperative Extension, 1432 Abbott, Salinas, CA 93901.

The use of JMS Stylet-Oil as a control for powdery mildew and bunch rot of grapes was investigated under California vineyard conditions. Stylet-Oil at 2% (v/v) was compared in commercial vineyards with commonly used fungicides including fenarimol, myclobutanil, triflumizole, and sulfur for powdery mildew control, or iprodione for bunch rot control. Stylet-Oil gave control of powdery mildew comparable to the demethylation inhibitor fungicides. Botrytis bunch rot was significantly reduced with Stylet-Oil alone, and when Stylet-Oil was mixed with iprodione a further reduction in bunch rot occurred. Grape juice fermentation as measured by yeast growth and sugar consumption was not affected by Stylet-Oil concentrations that ranged from 0 to 3.6 mL/L.

Key words: Stylet-Oil, powdery mildew, bunch rot, DMI (demethylation inhibitor), fermentation

Submitted on January 7, 1997






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Copyright © 1998 by the American Society for Enology and Viticulture.