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Occurrence of Sweetpotato Chlorotic Leaf Distortion (Fusarium lateritium) in North Carolina. J. B. Ristaino, Department of Plant Pathology, North Carolina State University, Raleigh 27695-7616. C. W. Averre, G. Abad, and W. R. Jester. Department of Plant Pathology, North Carolina State University, Raleigh 27695-7616, and Agricultural Extension Service, Box 757, Kinston, NC 28501. Plant Dis. 75:750. Accepted for publication 26 February 1991. Copyright 1991 The American Phytopathological Society. DOI: 10.1094/PD-75-0750.

Chlorotic leaf distortion of sweetpotato (Ipomoea batatas (L.) Lam.) was observed in midseason in 1987 in fields of sweetpotato cv. Jewel in North Carolina. During 1988-1990, the symptoms were seen in many cv. Jewel fields in 10 counties. Symptoms included stunting of vines, purple vine terminals, delayed leaf unfolding, deformation of young leaves with raised veins, and interveinal chlorosis on mature leaves. Most mature leaves recovered from symptoms. A white "waxy" substance concentrated on or near the leaf margins and diffused over the adaxial leaf surface consisted of mycelia, macroconidia, and microconidia of Fusarium lateritium Nees:Fr. The pathogen was repeatedly isolated from surface-disinfested apical buds, petioles, leaves, and stems but not from storage or fibrous roots. F. lateritium was also isolated from cvs. Beauregard, Southern Delite, Regal, and Excel and was observed in foundation, certified, and registered planting material. Isolates were sent to the departments of plant pathology at Louisiana State University and The Pennsylvania State University for confirmation of identity. These observations are consistent with those of Clark et al (1) and confirm the occurrence of F. lateritium in sweetpotato fields in North Carolina.

Reference: (1) C. A. Clark et al. Phytopathology 80:741, 1990.