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Growth and Nutrition of an Alternaria Pathogenic to Snapbeans. Sami Saad, Department of Plant Pathology, University of Wisconsin, Madison 53706; D. J. Hagedorn, Department of Plant Pathology, University of Wisconsin, Madison 53706. Phytopathology 60:903-906. Accepted for publication 14 January 1970. DOI: 10.1094/Phyto-60-903.

Alternaria tenuis (Syn. A. alternata), the causal organism of Alternaria leaf spot of bean, grew on potato-dextrose agar from 4 to 36 C, the optimum being 28 C. No isolate grew well at 4 or 36 C. Mannose, dextrose, and maltose were the best carbon sources, and fructose supported good growth of isolate H₅. Casein hydrolysate, glutamic acid, asparagine, and tyrosine as amino acid sources supported maximum growth of the fungus. Peptone and sodium nitrate promoted best growth of isolate M₄, whereas peptone and calcium nitrate were superior for isolate H₅. Alternaria tenuis grew well over the wide pH range of 4.4 to 7.6, the optimum being 6.5.