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Articles by T. Saravanan
Total Records ( 3 ) for T. Saravanan
  T. Saravanan , M. Muthusamy and T. Marimuthu
  A detailed study was conducted to find out the efficacy of Pseudomonas fluorescens on fusarium wilt pathogen in banana rhizosphere. All the strains of P. fluorescens isolated from banana rhizosphere had significant inhibitory action on the growth of Fusarium oxysporum f.sp. cubense. Among the strains, Pfm of P. fluorescens had higher inhibitory action while comparing with other strain. Talc formulation of Pfm of P. fluorescens was prepared and applied in three month old banana plants to study their efficacy on fusarium wilt disease. After three month of inoculation, Pfm of P. fluorescens inoculated at 10 and 15 g plant ha-1 showed lesser vascular discoloration index than the control. To study the rhizosphere colonizing ability in banana rhizosphere against fusarium wilt disease, a rifampicin resistant strain of Pfm of P. fluorescens was developed. The banana plants inoculated with a rifampicin resistant strain of Pfm of P. fluorescens showed gradual increase in population of P. fluorescens in the rhizosphere over the period of time upto 60 days after inoculation. The extracts of soil inoculated with rifampicin resistant strain of Pfm of P. fluorescens at 10 g plant ha-1 showed significant reduction in spore germination of F. oxysporum f.sp. cubense. Gradual increasing in the reduction of spore germination was observed in the soil extracts over the period of inoculation upto 60 days after inoculation. Similarly, the filter paper dipped in extracts of soil had higher inhibition of growth of F. oxysporum f.sp. cubense at 60 days after inoculation.
  S. Harish , T. Saravanan , R. Radjacommare , E.G. Ebenezar and K. Seetharaman
  Rice brown spot caused by Helminthosporium oryzae Breda de Hann is a major constraint for rice production. Fifteen seed extracts were evaluated at 10% concentration under laboratory condition against Helminthosporium oryzae. Among them rhizome extract of turmeric (Curcuma longa L.), seed extracts of sundavathal (Solanum indicum L.) and Vedpalai (Wrightia tinctoria Roxb.) exerted the maximum inhibition of the mycelial growth and spore germination of H. oryzae proving the antifungal activity against the pathogen. Thus the plant extract with mycotoxic effect can be well exploited in future for the control of H. oryzae in rice.
  T. Saravanan and V. Valluvaparidasan
  The fungitoxic effect of biocontrol agents and plant extracts on seed-borne fungi of sorghum was evaluated. The biocontrol agents viz., Bacillus subti/is, Pseudomonas fluorescens and Trichoderma viride significantly inhibited the mycelial growth of sorghum seed-borne fungi viz., Acremonium strictum, Allernaria tennis, Aspergillus niger, Curvularia lunata, Fusarium moniliforme, HelimiMhosporium halodes and Heliininthosporium tetramera. Among them B.subtilis exhibited maximum reduction in mycelial growth of all fungi. Among leaf extracts viz., Albizia amara, Catharanthus roseus and Prosopis jut/flora screened, C. roseus at 20% concentration possessed maximum inhibition of mycelial growth of A. n/`ger, C.lunata and F. moniliforme, where as 20% leaf extracts of P. juliflora inhibited the growth of remaining fungi. The culture filtrates of B. subtitis exerted significant reduction in mycelial weight of all fungi, except C.lunata. The maximum reduction of mycelial weight of all fungi was observed in 20% leaf extract of C. roseus among the plant extracts except for F.moniliforme.
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