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Integrated Management against Root-rot of Mungbean [Vigna radiata (L.) Wilczek] incited by Macrophomina phaseolina

Ekha Kumari, KS Shekhawat, Renu Gupta and MK Khokhar

Root rot is an important disease of mungbean [Vigna radiata (L.) Wilczek] caused by Macrophomina phaseolina (Tassi) Goid was observed in farmers field of Rajasthan. For the integrated management of the disease, biocontrol agents, fungicides, herbal oils, plant extracts and organic manure as well as their combinations. Among the tested biocontrol agents against Macrophomina phaseolina, T. harzianum was found the most effective against the fungus under in vitro and in pots conditions followed by T. viride and T. polysporum. P. fluorescens was the least effective in reducing root rot incidence. All the five herbal oils and three plant products tested in vitro by poisoned food technique, inhibited the growth of fungus. All herbal oils gave complete inhibition of mycelial growth of pathogen at 2% concentrations. Asafoetida was found least effective. The relative efficacy of herbal oils and plant products under pots house condition exhibited palmarosa oil to be the most effective as seed dresser in reducing root rot incidence. All the seven fungicides were tested in vitro by poisoned food technique and in pots (in vivo), bavistin was considered to be the most effective to inhibit mycelial growth of pathogen as well as reducing root rot incidence, followed by captan or thiram, indofil M-45 and vitavax or raxil, while copper sulphate was the least effective treatment in both conditions. In the case of organic manures, vermicompost was the most effective in reducing the root rot incidence under pots conditions. FYM and goat manure was found moderately effective in controlling root rot incidence. Integrated management approach showed that vermicompost and bavistin in combination was more effective in reducing the root rot incidence in pots conditions.