Studies on Epidemiology and Management of root-rot of clusterbean
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Date
2005
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CCSHAU
Abstract
Root-rot complex in clusterbean caused by Rhizoctonia bataticola,
Fusarium solani and Sclerotium rolfsii is a major disease of clusterbean [Cyamopsis
tetragonoloba (L.) Taub] in Haryana. The inoculum age of 7 days old culture,
inoculum density of 50g/kg soil, soil temperature of 30oC, soil moisture of 30 per cent
water holding capacity (WHC) and soil pH of 6.0 were found to be optimum for
disease development in three varieties, viz. FS-277, Pusa Nav Bahar (PNB) and
HG-75.
Garlic extract at 20 per cent concentration was found most effective
against root-rot complex which showed maximum inhibition of the pathogen, i.e.,
90.25 per cent under laboratory conditions. Under screenhouse conditions garlic
extract at 20 per cent concentration in HG-75 was found most effective against the
pathogens which exhibited minimum seedling mortality (4.75%). Trichoderma
harzianum was found an effective antagonist against root-rot complex which showed
maximum inhibition of the pathogen, i.e., 73.77 per cent under laboratory conditions.
Under screenhouse conditions Trichoderma harzianum in HG-75 was found most
effective against the pathogens which exhibited minimum seedling mortality (5.50%).
Among organic amendments mustard residue and vermicompost when applied in
combination @ 5g/kg soil resulted in maximum disease control, i.e., 11.75 per cent
seedling mortality in HG-75.
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