Annals of Plant Protection Sciences
Year : 2003, Volume : 11, Issue : 1
First page : ( 57) Last page : ( 60)
Print ISSN : 0971-3573. Online ISSN : 0974-0163.

Effect of Pseudomonas fluorescens Isolates on Sclerotial Viability of Rhizoctonia solani (Ktihn)

Pande V.S., Chaube H.S.¹

ACRP on Spices, Department of Horticulture, College of Agriculture, Dr Balasaheb Sawant Konkan Krislu Vidyapeeth, Dapoli, 415712

¹Centre for Advanced Studies in Plant Pathology, G.B. Pant Univ. Agri. & Tech., Pantnagar, 263145, India

Abstract

In vitro antibiosis of 6 isolates of Pseudomonas fluorescens resulted in reduction of mycelial growth of Rhizoctonia solani and the inhibition zone ranged from 1.3 to 22.5 mm in different isolates on Kings-B medium Similarly. 3.3 to 12.0 mm inhibition zone was recorded on PDA. Sclerotial inactivation studies indicated thai pre-tieatment jf bacterial isolates to sclerotia for different lengths of time affected sclerotial viability in vitro Pie-treatment of sclerotia resulted in 3.3 to 100% inhibition in their germination after these were immersed in bacterial cell suspension of P fluorescens isolates for 1 min. to 4 weeks. In green house study, there was 17 7 to 100% reduction in rice sheath blight infection due to pre-treatment of sclerotia for 4 weeks in suspension of P fluorescens isolates

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Keywords

Antibiosis, Pseudomonas fluorescens, Rhizoctonia solani..

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