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Reaction of Nicotiana Species to Alternaria alternata. J. R. Stavely, Research Plant Pathologist, Crops Research Division, ARS, USDA, Beltsville, Maryland 20705; G. W. Pittarelli(2), and G. B. Lucas(3). (2)Agricultural Research Technician, Crops Research Division, ARS, USDA, Beltsville, Maryland 20705; (3)Professor of Plant Pathology, Department of Plant Pathology, North Carolina State University, Raleigh, North Carolina 27607. Phytopathology 61:541-545. Accepted for publication 11 December 1970. DOI: 10.1094/Phyto-61-541.

Nicotiana bonariensis, N. wigandioides, N. debneyi, N. noctiflora, N. repanda, and two accessions each of N. suaveolens and N. longiflora were consistently among the most resistant of 63 Nicotiana species in independent tests of reactions to Alternaria alternata conducted at Beltsville, Md., and Raleigh, N. C. Nicotiana nesophila, N. stocktonii, N. goodspeedii, N. hesperis, N. occidentalis, and N. forgetiana were highly resistant at one of the locations and lightly infected at the other location. Stem lesions developed on 56 species; and typical, restricted lesions developed on the youngest inoculated leaves of 61 species. All species in subgenus Tabacum and all species but N. thyrsiflora in subgenus Rustica were moderately or highly susceptible to the disease at one or both test sites.

Additional keywords: Nicotiana subgeneric relationships, breeding for resistance.