PREVALENCE OF ANTAGONISTIC RHIZOSPHERIC MICROFLORA IN RICE AND THEIR POTENTIALITY IN MANAGING STEM ROT DISEASE (Sclerotium oryzae Catt.) IN in vitro CONDITIONS
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Authors
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K. GOPIKA, R. JAGADEESHWAR, V. KRISHNA RAO and K. VIJAYALAKSHMI
Department of Plant Pathology, College of Agriculture, Professor Jayasankar Telangana State Agriculture University, Rajendranagar, Hyderabad-500030
Abstract
Trichoderma spp. and Plant Growth-Promoting Rhizobacteria (PGPR) such as Pseudomonas fluorescens and
Bacillus spp. were prevalent antagonists in rice rhizosphere. Dual culture assays indicated that the strains T. viride
(T1) and P. fluorescens (B1) were superior among other rhizospheric isolates such as Aspergillus niger, A. flavus
(fungal) and Bacillus spp. (bacterial). Pesticide compatibility studies indicated that T. viride (T1) was completely
sensitive (100% inhibition) to fungicides such as hexaconazole and propiconazole; whereas butachlor (weedicide)
exhibited up to 61% inhibition of the fungal antagonist. The P. fluorescens (B1) was found to be compatible with the
fungicides and herbicide under study with inhibitions of <10%. Overall, our results determined the prevalence of
Trichoderma spp. and PGPR in rice rhizosphere, their sensitivity to different agrochemicals and potential suppressing
abilities against stem rot pathogen.
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