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Stabilization of Conidium Morphology in Cultures of Alternaria longipes. E. K. Sobers, Associate Professor of Plant Pathology, University of Georgia College of Agriculture Experiment Stations, Coastal Plain Station, Tifton 31794; B. Doupnik, Jr., Assistant Professor of Plant Pathology, University of Nebraska, South Central Station, Clay Center 68933. Phytopathology 63:191-192. Accepted for publication 25 July 1972. DOI: 10.1094/Phyto-63-191.

Five of 58 isolates of Alternaria longipes pathogenic to tobacco retained their morphological identity and pathogenicity after 4 to 5 years in culture. Conidia produced by most of the remaining 53 isolates changed from the long, wide body (39.1 × 15.2 µ), and long-beaked (20.6 µ) type exhibited by pathogenic isolates, to type II conidia with short, narrow bodies (25.3 × 10.8 µ), and short beaks (5.9 µ). The majority of 79 isolates that were initially nonpathogenic exhibited a similar change in morphology to type II conidia. It is assumed that at least in culture, type II conidia represent the most stable form of A. longipes.