Abstract
Aggressiveness of fifteen isolates of Phaeoisariopsis griseola and variations in angular leaf spot symptom development in common bean were studied. The isolates were selected based on their virulence and genetic differences and represented Andean, Afro-Andean and Mesoamerican groups of P. griseola. Aggressiveness was determined based on length of incubation period, rate of lesion expansion, lesion size and density, rate of sporulation, disease severity and area under disease progress curve (AUDPC). There was a wide variation in aggressiveness and the type of symptoms induced by the different isolates of the pathogen. Incubation period varied significantly (P Keywords : Disease severity, incubation period, sporulation, symptom, virulence group J. Trop. Microbiol. Biotechnol. Vol. 3 (2) 2007: pp. 3-13
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