Received for publication April 18, 1981.
Farm Advisor, Merced County.
Professor, Department of Horticulture.
Professor and Head, Department of Plant Pathology and Crop Physiology.
Assistant Professor, Department of Plant Pathology and Crop Physiology.
Superintendent, Fruit and Truck Station, RFD 2, Box 71, Hammond, LA 70401.
Superintendent, Sweet Potato Research Center, Chase, LA 71324.
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