EVALUATION OF COMPATIBLE BIO-AGENTS AND SELECTED BOTANICALS AGAINST RHIZOME ROT DISEASE OF GINGER

Abstract

A pot and lab experiments were conducted in Bio-agents laboratory and the net house of The Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh during the period from July,2019 to June, 2020. The study was carried out to evaluate the efficacy of selected compatible bio-agent viz. Verticillium lecanii (T 1 iii

), Beauveria bassiana (T 2) , Metarhizium anisopliae (T 3 ), Trichoderma viride (T 4 ) and botanicals viz.Tea wastage (T 5 ), Neem leaves extract (T 6 ), Allamanda leaves extract (T 7 ) against the pathogen of rhizome rot disease responsible for ginger decline. The selected bio-agents were applied as a bio-fortified materials. In the pot bio-agents were bio-fortified with the selected substrates; cow dung, mustard oil cake, poultry manure, dust and wheat grain. Data on disease incidence and disease severity was recorded at 50, 70 and 90 Days After Planting (DAP). Among the selected bio-agents the lowest disease incidence and severity was found in T 3 (Metarhizium anisopliae) and the highest in T 1 (Verticillium lecanii). Among the selected botanicals the lowest disease incidence and severity was found in T 5 (Tea wastage) and the highest was found in T 7 (Allamanda leaf extract). No disease was found in T 6 (Neem extract) treatment up to harvesting. The selected treatments were also gave the promising performance in inhibition of radial mycelial growth of Fusarium oxysporum over untreated control. From the in-vitro management study it was found that Trichoderma viride (T 4 ) and Metarhizium anisopliae (T 3 ) gave the better performance in inhibition of radial mycelial growth. Among the botanicals, neem extract gave the promising performance in inhibition of radial mycelial growth. However, from the present study it may be concluded that Metarhizium anisopliae, Trichoderma viride and Neem leaf extract can be used for management of rhizome rot disease of ginger.