1Received for publication April 18, 1981.
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2Farm Advisor, Merced County.
3Professor, Department of Horticulture.
4Professor and Head, Department of Plant Pathology and Crop Physiology.
5Assistant Professor, Department of Plant Pathology and Crop Physiology.
6Superintendent, Fruit and Truck Station, RFD 2, Box 71, Hammond, LA 70401.
7Superintendent, Sweet Potato Research Center, Chase, LA 71324.
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