Susceptibility of Weed Species of Convolvulaceae to Root-Infecting Pathogens of Sweet Potato. C. A. Clark, Associate Professor, Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Experiment Station, Baton Rouge 70803. Barbara Watson, Research Associate, Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Experiment Station, Baton Rouge 70803. Plant Dis. 67:907-909. Accepted for publication 2 February 1983. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-907.

Species of Convolvulaceae that commonly occur as weeds in agricultural land in Louisiana (Ipomoea alba, I. hederifolia, I. hederacea, I. lacunosa, I. purpurea, I. trichocarpa, I. wrightii, and Jacquemontia tamnifolia) were compared with Centennial sweet potato for reaction to Streptomyces ipomoea, Ceratocystis fimbriata, Fusarium oxysporum f. sp. batatas, Plenodomus destruens, Monilochaetes infuscans, Rotylenchulus reniformis, and Meloidogyne incognita. Several species were as susceptible or more susceptible than Centennial for each pathogen and no species was immune to any pathogen. Each host species was susceptible to several pathogens but I. alba, I. hederifolia, and J. tamnifolia were generally less susceptible to the pathogens than Centennial or the other species.