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ANUSHA BASAVARAJ GINDI1,2, SUBRAMANIAM GOPALAKRISHNAN2*
AND MANJUNATH KRISHNAPPA NAIK1,3
1. University of Agricultural Sciences, Raichur 585 204, Karnataka, India
2. International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru 502 324, Telangana, India.
3. University of Agricultural and Horticultural Sciences, Shivamogga 577 201, Karnataka, India
Five strains of Streptomyces (AC-5, AC-6, AC-10, AC-18 and AC-19) and another five strains of Bacillus (BS-10, BS-15, BS-17, BS-19 and BS-20) were earlier reported by us as biological control agents against Fusarium wilt of chickpea, caused by Fusariumoxysporum f. sp. ciceri (FOC), and plant growth-promoting agents in chickpea. In the present study, the selected Streptomyces and Bacillus were further characterized for their antagonistic potential against dry root rot of chickpea, caused by Rhizoctoniabataticola, by dual culture assay, blotter paper assay and in greenhouse. Both the Streptomyces and Bacillus strains inhibited three strains of R. bataticola(RB6, RB24 and RB115) in both dual culture and blotter paper assays. When these were further evaluated for their antagonistic potential against R. bataticolaunder greenhouse conditions, reduced incidence of dry root rot was observed in Streptomyces and Bacillus treatments compared to the pathogen control.Among the ten strains studied,AC-18and BS-20recorded the highest reduction of disease both at 30 days after sowing (DAS) (58% and 75%, respectively)and 45 DAS (36% and 48%, respectively), when compared to the pathogen control.This study indicates that the selected Streptomyces and Bacillus strains have the potential for biocontrol of dry root rot of chickpea.
Biocontrol, Streptomyces spp., Bacillus spp.,dry root rot, chickpea