ECO-FRIENDLY APPROACHES FOR THE MANAGEMENT OF COLLAR ROT OF MUNGBEAN CAUSED BY Sclerotium rolfsii

Abstract

Mungbean is a highly nutritive and protein rich crop. Collar rot caused by Sclerotium rolfsii is the major disease of mungbean causes a considerable yield loss in Bangladesh. Frequent use of chemical fungicides to control the disease is causing serious environmental hazards. The in vitro experiment was conducted at Plant Pathology Laboratory located in Wazed Miah Central Laboratory and field experiment was conducted in Central farm of Sher-e-Bangla Agricultural University during January, 19−January, 2020. The experiment was conducted to isolate, identify and to develop eco-friendly management of Sclerotium rolfsii. The isolated organism causing collar rot of mungbean identified as Sclerotium rolfsii based on its key characteristics (CMI Description No. 410). For management of the disease, a bioagent (Trichoderma harzianum), two botanicals (allamanda and neem leaf extract), three soil amendments (mustard oil cake, Krishibid organic fertilizer, virmicompost), two fungicides (Autostin 50WDG and Goldton 50WP) were evaluated in laboratory as well as in field and integration of those components was done in field. Seed treatment with Trichoderma harzianum and soil drenching with allamanda leaf extract was found most effective in reducing 91.31% disease incidence and increasing 183.01% yield over control. Soil drenching with Trichoderma harzianum suspension and seed treatment with Autostin 50 WDG reduced disease incidence 91.05% and increased yield 169.81% over control. Trichoderma harzianum suspension + Mustard oil cake + Krishibid organic manure + vermicompost, Trichoderma harzianum suspension + Goldton 50 WP, Trichoderma harzianum suspension, Krishibid organic fertilizer, vermicompst, mustard oil cake was found effective and increased 156.60%, 118.87%, 116.87%, 113.01%, 88.67%, 88.6%, 37.7% yield over control, respectively. The highest BCR value was recorded in combined application of Trichoderma harzianum and allamanda leaf extract.