Biology and Fertility of Soils

, Volume 20, Issue 4, pp 221–225

Biological control of Rhizoctonia sp. root rot of Casuarina equisetifolia seedlings by Frankia spp. strains

  • S. Gopinathan
Original Paper

DOI: 10.1007/BF00336081

Cite this article as:
Gopinathan, S. Biol Fertil Soils (1995) 20: 221. doi:10.1007/BF00336081


Seventy Frankia spp. strains (nodulating N2-fixing actinomycetes) were isolated from root nodules of Casuarina equisetifolia from different localities of Tamil Nadu state, India. From these, four strains (UMCe12, UMCe23, UMCe35, and UMce55) were selected. Their potential use as biological control agents for Rhizoctonia solani root rot disease of C. equisetifolia seedlings and their relative efficiency in nodule production were investigated. Between the two inoculum broadcast systems tested, seed-coating with Frankia spp. cell suspension was superior to the soil application of cells as sand-vermiculite-basal ammonium propionate inoculum. UMCe12 was the promising strain, offering the highest level of disease protection (81.1%) and nodule production (88.1%) in the R. solani-infested soil, followed by UMCe23 (60.3 and 65.5% of disease protection and nodule production, respectively), UMCe55 (53.5 and 58.2%), and UMCe35 (45.4 and 44.5%). Further, a significant positive correlation was observed between the dose of Frankia spp. and efficiency in both disease control and nodule production.

Key words

Biological controlRhizoctonia solaniFrankia sppstrainsSeed coatingSoil broadcastingDisease protectionNodule production

Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • S. Gopinathan
    • 1
  1. 1.Centre for Advanced Studies in BotanyUniversity of MadrasMadrasIndia
  2. 2.J-7, Horizon ApartmentsMadrasIndia