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.
