An experiment was carried out to study the cultural, morphological, and pathogenic variability of different isolates of Sclerotium rolfsii infecting tomato crop under the undulating red and lateritic zone of West Bengal. Cultural and morphological variability of isolates were studied based on their mycelial growth rate, colony colour, mycelial dispersion and appearance and sclerotia formation, colour, weight and number of sclerotia, arrangement and maturity days of sclerotia using potato dextrose agar medium. Pathogenic variability was studied based on pathogenicity test and host range study by soil infestation method. | Cultural morphological and pathogenic variability of different isolates of sclerotium rolfsii obtained from rice-tomato-rice cropping system of undulating red and lateritic zone of West Bengal India
