Analysis of morphological and cultural variability among thirteen isolates of Alternaria brassicae provides information about morphological variation and favorable cultural conditions in vitro when such situations become available under cropping environment, which could result in severe infection of Alternaria blight due to isolates existing in different geographical regions of India. This also reflected the adaptation of the respective isolates to the ambient conditions in the different cropping areas, where the disease occurs in varied proportions in different years, which may have also...