The Glomerella cingulata Perfect Stage and Apple Bitter Rot. W. W. Shane, Graduate Research Assistant, Department of Plant Pathology, North Carolina State University, Raleigh 27650. T. B. Sutton, Assistant Professor, Department of Plant Pathology, North Carolina State University, Raleigh 27650. Plant Dis. 65:135-137. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-135.

Perithecial strains of Glomerella cingulata were detected in five apple orchards in North Carolina. The relative frequency of perithecial strains varied from orchard to orchard. Airborne G. cingulata ascospores were detected within an apple orchard and within 3 m of both naturally and artificially infected apple branches. Ascospore catches were maximal during the evening and early morning, especially on and after rainy days.

Keyword(s): epidemiology.