Temperature-based sulfur applications to control grape powdery mildew
AuthorsMary Ann Sall
Frank J. Schick
Authors AffiliationsMary Ann Sall is Assistant Professor, Department of Plant Pathology, University of California, Davis; Jeanette Wrysinski is Staff Research Associate, Department of Plant Pathology, University of California, Davis; Frank J. Schick is Staff Research Associate, Department of Plant Pathology, University of California, Davis.
Hilgardia 37(7):4-5. DOI:10.3733/ca.v037n07p4. July 1983.
Powdery mildew (Uncinula necator) has been a consistent disease problem in California vineyards for over a century. For nearly that long, elemental sulfur has been applied for its control. Agricultural bulletins dating to the 1890s describe the treatment schedule still in use today: regular applications of sulfur at 7- to 14-day intervals during the period of vine susceptibility. The interval may be adjusted for local conditions and grape variety, but no systematic method for determining the best timing has been previously presented. The past recommendations have led to under- or over-use of sulfur in years when environmental conditions are more or less favorable for epidemic spread.
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