STUDIES ON PYTHIUM SOFT ROOT ROT DISEASE OF MULBERRY
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Date
2019-08-28
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University of Agricultural Sciences, Bangalore
Abstract
Mulberry crop affected by many diseases and threatening the mulberry cultivation. Recently, some of the mulberry gardens were infected with soft root rot disease with symptoms like withering and drying of leaves, mucilaginous matrix on bark of the roots resulting roots become soft and ultimately the plant showed epinasty and wilting. The soft root rot disease was observed in Agara (43.76 %), Kebre (32.57%), Thattekere (18.79%) and Gerehalli (13.58%) villages of Ramanagara district and Maddur (7.89 %), Halaguru (16.78 %) and Malavalli (6.58 %) of Mandya district. The pathogen Pythium sp. Was isolated from infected roots and identified based on morphological characters and proved pathogenicity. The maximum growth of the pathogen was found at 25 °C with pH 7. PDA (90 mm) and V-8 agar (90 mm) supported maximum growth of the pathogen. Among the fungicides evaluated in vitro condition Captan (86.29 %), Mancozeb + Metalaxyl, Carbendazim + Mancozeb, Fenamidone + Mancozeb, Azoxystrobin + Mancozeb (94.44 %), and Tebuconazole (100 %) were found effective. Among botanicals, neem extract (14.02 %) had highest inhibition of the pathogen. Trichoderma viride-1 (95.54 %) and Bacillus pumilis (58.88 %) were effective in vitro conditions. The bio-agents T. viride-1 and T. viride-2 found effective in glasshouse and field conditions. The effective fungicides Mancozeb + Metalaxyl (0.1 %) and Captan (0.2 %) reduced disease under field conditions up to 31.96 and 27.45 per cent, respectively. These fungicides, botanicals and bio-agents can be exploited for the management of soft root rot disease of mulberry.