Society of Agricultural Scientists

S.V. Agricultural College, Tirupati

Acharya N.G. Ranga Agricultural University

Andhra Pradesh, India

IN VITRO SCREENING OF BIO EFFICACY OF DIFFERENT ISOLATES OF Trichoderma viride AND Pseudomonas fluorescens ON THE MYCELIAL GROWTH OF Sclerotium rolfsii INCITANT OF GROUND NUT STEM ROT.

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B. RAGHAVENDRA, T. SRINIVAS AND B. PADMODAYA

Department of Plant Pathology, S. V. Agricultural college, ANGRAU, Tirupati-517 502, Chittoor Dt., Andhra Pradesh, India.

ABSTRACT

The antagonistic effect of three isolates Tr-DM, Tr-SNG and Tr-RGP of Trichoderma viride and three isolates Pf-DM, Pf-SNG and Pf-RGP of Pseudomonas fluorescens against Sclerotium rolfsii were assessed by dual culture technique in vitro. The isolates of fungal agent T. viride were more effective in controlling the mycelial growth of S. rolfsii when compared with isolates of bacterial bio control agent P. fluorescens. Among the fungal bio-control agents maximum inhibition (87.18%) of mycelial growth of S. rolfsii was observed with the DM-Tr isolate of T. viride and among bacterial isolates maximum inhibition (28.25%) of mycelial
growth of S. rolfsii was observed with the Pf-DM isolate of P. fluorescens.

KEYWORDS:

Bio agents, dual culture, inhibition, Trichoderma viride and Pseudomonas fluorescens, Sclerotium rolfsii.

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