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Indian Journal of Nematology
Year : 2014, Volume : 44, Issue : 1
First page : ( 50) Last page : ( 55)
Print ISSN : 0303-6960. Online ISSN : 0974-4444.

Estimation of Pasteuria penetrans Spore Load and effect of Selective Elimination of Soil Fungi and Bacteria on the Efficacy of P. penetrans in the Suppression of Meloidogyne javanica in Soil

Kumar Matcha Udaya, Walia Raman Kumar*

Department of Nematology, CCS Haryana Agricultural University, Hisar, Haryana-125 004, India

*Corresponding author, E-mail: raman261156@gmail.com

Online published on 18 October, 2014.

Abstract

Based on a laboratory bioassay, a statistical model was developed for the estimation of Pasteuria penetrans spores in field soil (clay- 7.6%, silt- 2.0%, sand- 90.4%, pH- 7.0, organic matter- 0.77%). The role of P. penetrans in the suppression of Meloidogyne javanica in naturally infested field soil was studied in a green-house test. The soil was steam-sterilized or treated with Formalin or fungicides Ridomil and/or Bavistin for complete or selective elimination of native soil biota. Ridomil alone did not adversely affect the nematode root infection and reproduction. P. penetrans alone caused 87.5% infection endospores and reduced egg production by about 10 times. Native fungal and bacteria promoted attachment of P. penetrans endospores but inhibited parasitisation of nematode females by P. penetrans in untreated soil.

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Keywords

Bavistin, bio-control, Formalin, naturally infested soils, Pasteuria penetrans, okra, Ridomil, Soil sterilization.

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