Browsing by Author "Sivakumar, G."

Now showing 1 - 4 of 4
  • Thumbnail Image
    Item
    Bioefficacy of peat formulation of bacterial antagonists on growth promotion and disease suppression in cardamom (Elettaria cardamomum Maton)
    (2012) Sivakumar, G.; Josephrajkumar, A.; Rangeshwaran, R.
    Among the 90 rhizobacterial isolates screened against capsule rot pathogen of cardamom Phytophthora meadii Mc Rae two bacterial strains viz., Pseudomonas fluorescens Pf 51 and Bacillus subtilis Bs were found highly inhibitory. Strain Pf 51 exhibited highest inhibition (40.2%) against P. meadii. Similarly B.subtilis strain Bs also exhibited highest inhibition (39.7%) against P. meadii. P. fluorescens strain Pf51 was found compatible with strain B. subtilis Bs. Application of antagonists both Pf 51 and Bs in combination with rhizome bacterization and soil application resulted in 60% reduction of capsule infection over control as compared to single methods such as rhizome bacterization (53%) and soil application (46%). Application of copper oxy chloride resulted in 73% reduction of capsule infection. Maximum height (169.7cm) and number of tillers (36.3) were recorded due to the application of mixture of both the strains through rhizome bacterization and soil application.
  • Thumbnail Image
    Item
    Evaluation of bacterial antagonists for the management of rhizome rot of cardamom (Elettaria cardamomum Maton)
    (2012) Sivakumar, G.; Josephrajkumar, A.; Dhanya, M.K.
    Among the 90 rhizobacterial isolates screened against rhizome rot pathogens (Pythium vexans, Fusarium oxysporum and Rhizoctonia solani) of cardamom (Elettaria cardamomum) two bacterial strains viz., Pseudomonas fluorescens Pf 51 and Bacillus subtilis B45 were highly inhibitory. P. fluorescens Pf 51 exhibited highest inhibition (42.5%, 44.2% and 41.4% respectively) against P. vexans, F. oxysporum and R. solani. B. subtilis B45 also exhibited highest inhibition (43.2%, 41.2% and 42.4% respectively) against these three pathogens. P. fluorescens Pf51 was compatible with B. subtilis Bs 45. Peat formulation supported the survival of both the strains up to 270 days with a viable population of 4.3 × 107 cfu g-1 and 6.2 × 107 cfu g-1 respectively. Application of antagonists in combination with rhizome bacterization and soil application resulted in 54.0% reduction in rhizome rot over control as compared to single method such as rhizome bacterization (43.0%) or soil application (39.0%). Application of copper oxychloride and carbendazim resulted in 68.0% reduction of rhizome rot. Maximum height (167.21 cm) and number of tillers (30.14) were recorded due to the application of mixture of both the strains through rhizome bacterization and soil application.
  • Thumbnail Image
    Item
    Root priming with Bacillus spp. against bacterial wilt disease of tomato caused by Ralstonia solanacearum
    (2017-11) Sivakumar, G.; Rangeshwaran, R.; Mahesh S Yandigeri; Rajkumar; Surabhi Kumari
  • Thumbnail Image
    Item