Vol. 12, Issue 10 (2023)

Author(s):
Adyasha Das and Shyama Sundar Mahapatra

Abstract:
Use of biocontrol agents against soil borne pathogen is gaining importance in the present situation for eco-friendly management of soil borne diseases. The seed treated with Rhizobium along with soil application of T. hamatum enriched Vermicompost was found to be most effective in reducing the incidence of wilt complex (F. oxysporum and S. rolfsii) of green gram. The same treatment combination was superior in case of growth parameters i.e., no of grain, no of pods per plant,1000 grain weight, leaf no, shoot length, root length, dry matter and chlorophyll content of green gram. In case of F. oxysporum inoculated soil this treatment was found to be best with 10.67 no of pods, 10.00 no of grains / pod, 40.40 g thousand grain weight, 8.5 no of leaves, 42.85 cm shoot length, 30.53 cm root length, 10.61 g dry matter, 3.62 mg chlorophyll content and with the least percent disease incidence of 7.05 followed by seed treatment with Rhizobium sp @ 10 ml / kg of seed and soil application of Trichoderma hamatum enriched vermicompost @ 20 g / kg of soil at an interval of 7, 14 & 21 DAS with 10.00 no of pods, 8.66 no of grains per pod, 38.11 g thousand grain weight, 7.50 no of leaves, 41.53 cm shoot length, 25.66 cm root length, 9.88 g dry matter, 3.17 mg chlorophyll content and 12.66`% of disease incidence. In case of S. rolfsii inoculated soil seed treatment with Rhizobium sp @ 10 ml / kg of seed and soil application of T. hamatum enriched vermicompost @ 20 g / kg of soil at weekly interval of 7, 14, 21 & 28 DAS was found to be the best with 10.50 no of pods, 10.50 no of grains / pod, 40.75 g thousand grain weight, 9.33 no of leaves, 45.00 cm shoot length, 31.46 cm root length, 10.35 g dry matter, 3.69 mg chlorophyll content and with the least percent disease incidence of 6.71 followed by seed treatment with Rhizobium sp @ 10 ml / kg of seed and soil application of T. hamatum enriched vermicompost @ 20 g / kg of soil at an interval of 7, 14 & 21 DAS with 9.33 no of pods, 8.66 no of grains per pod, 37.03 g thousand grain weight, 9.00 no of leaves, 39.26 cm shoot length, 30.30 cm root length, 9.00 g dry matter, 3.29 mg chlorophyll content and 14.99`% of disease incidence. Integrated Disease Management (IDM) approach was carried out to combat green gram wilt with a combination of bio agents and organic amendments. Soil application of bio agents enriched with Vermicompost showed additive effect over the seed treatments.