Host range and pathogenic variation in isolates of Rhizoctonia solani incitant of wet root rot in chickpea.

摘要

Studies were conducted to find out the extent of host range and pathogenic variation among seven isolates of Rhizoctonia solani collected from Rajasthan, Haryana and New Delhi. All seven isolates tested for their pathogenicity using susceptible varieties viz. C-235 of chickpea, RC-101 of cowpea, RMO-225 of mothbean and RMG-344 of mungbean, had varying disease incidence levels in pot culture experiment using sterilized and unsterilized soil. The isolate Hisar-2775 on chickpea, Delhi-4097 on cowpea and Hisar-2775 on mothbean were highly virulent in both types of soil, while Delhi-4097 was highly virulent on mungbean in sterilized soil but not in unsterilized soil. Contrary to this the isolate Hisar-2775 was highly virulent in unsterilized soil. The incidence of disease appeared first on mungbean followed by chickpea, mothbean and cowpea in both soil types.