Management of root rot of black gram caused by Macrophomina phaseolina (Tassi) Goid using Trichoderma viride

摘要

© 2021, Crop Protection Research Centre. All rights reserved.Black gram is one of the important legume crops in India. It is a favorable pulse crop since it thrives better in all the seasons as a sole and intercrops or fallow crop. It is being infected by many phytopathogens. Among the phytopathogens, the root rot/ charcoal rot disease caused by Macrophomina phaseolina (Tassi.) Goid is a major disease, distributed worldwide and considered as the most serious one its management with chemical fungicides exhibit residual toxicity in the soil. It is therefore felt that, it is very essential to develop an effective, cheap and environmentally safe non-chemical method for the management of dry root rot of the pathogen. The biological control using antagonistic microorganisms offer a practical and economical alternative for management of plant pathogens. Hence the present investigation was conducted to test the efficacy of native antagonists of Trichoderma viride for the management of M. phaseolina. The results showed the in vitro efficiency of antagonist inhibited mycelial growth of M. phaseolina. T. viride (Tv6) which recorded the maximum inhibition zone of 81.55%. The culture filtrate of T. viride (Tv6) at a concentration of 30% was found to be maximally reduced in agar well method and poison food technique. Their culture filtrates were also found to be effective in promoting the in vitro growth. Tv6 also promote growth (root length, shoot length, plant biomass), numbers of pods and minimum disease incidence compared to the other isolates under in vivo condition. The findings reported in the present study supported the applicability of Tv6 isolate as a possible alternative to fungicides for the control of root rot in black gram.