Root-rot caused by M. phaseolina (a soil as well as seed-borne fungus) is a devastating disease of mungbean and causes serious yield losses. The present study has demonstrated that the fungus induced severe root-rot in mungbean cv. T-44 and exhibited significant decline in the plant growth and yield. This has verified that the tested mungbean cv. T-44 was susceptible to the root-rot fungus. Rotting of tap root and presence of few lateral roots is the characteristic symptom of the disease. Because of few lateral roots and root hairs, drying and withering of leaves occurs due to less water absorption. During the initial stages of pathogenesis, the fungal hyphae penetrates the root epidermis which is restricted to the intercellular spaces of the cortical tissues of the primary roots. Due to this, collapse of adjacent cells occurs and heavily infected plantlets may die. Afterwards at the onset of flower, the mycelium grow intracellularly through the xylem and plug the vessels [28, 29], produce toxins and several enzymes [30, 31], and thereby disrupt host cells. Inoculation with M. phaseolina decreased the growth and yield of mungbean by 32.1-45.5% and 36%, respectively.
Soil and seed borne nature of the pathogen creates problem for an effective management of the root-rot disease. Use of the chemicals is one of the best options for the management of plant diseases which is quick as well as effective method. The present approach was to manage the root-rot disease by using