1Received for publication September 27, 1980.
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2Professor, Department of Horticulture.
3Superintendent. Fruit and Truck Station, RFD 2, Box 71. Hammond, LA 70401.
4Superintendent. Sweet Potato Research Center, Chase. LA 71324.
5Professor and Head, Department of Plant Pathology & Crop Physiology.
6Assistant Professor. Department of Plant Pathology & Crop Physiology.
7Professor, Department of Entomology.
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