Cultural, morphological, physiological and pathogenic variability of Phaeoisariopsis griseola (Sacc.) Ferraris?The incitant of angular leaf spot disease in French bean (Phaseolus vulgaris L.)

Among the 12 isolates of P. griseola collected from different locations of Kashmir valley, the variation in morphological and physiological characteristics such as size of synnemata, conidiophore number per synnemata, size/septation of conidia and requirements for optimum level of nutrients, temperature and pH, though existed, no clear cut lime could be drawn to enable grouping of isolates in different categories. However, significant pathological variability existed based on the response of a set of eleven differential bean host plants to these isolates. In all, four groups (races) of P. griseola were identified. The ‘Group 1’ comprised of isolate Pg-1, Pg-6, Pg-8, whereas ‘Group 2’ included the isolate Pg-4, Pg-12 and Pg-9, while ‘Group 3’ and ‘Group 4’ included isolates Pg-2 and Pg-3 and Pg-5, Pg-7, Pg-10 and Pg-11, respectively.