Studies on Efficacy of Different Delivery Systems of Pseudomonas fluorescens for Biosuppression of Damping-off Disease in Tobacco Seed Beds


  • Central Tobacco Research Institute, Division of Crop Chemistry and Soil Science, Rajahmundry, Andhra Pradesh, 533105, India


Aexperiment in tobacco nursery was conducted to evaluate effect of different delivery systems for Pseudomonas fluorescens in the management of damping-off in tobacco seed beds. When talc enriched with P.fluorescens was applied, significantly highest population of P.fluorescens was recorded in seed treatment and soil application combination (32.3 x 107 CFUs/g soil) at 60 days after sowing and the same treatment recorded the lowest population of Pythium aphanidermatum (0.52 x 103 CFUs / g soil) of soil. As a result, 33 percent incidence of damping-off was recorded. Application of mancozeb + metalaxyl at 0.2 % recorded 25 percent of disease incidence and the untreated control recorded the maximum disease incidence of 83%. The study suggests that talc based delivery supports better survival of P. fluorescens in rhizosphere when compared to FYM and filter press cake and have potential for controlling Pythium aphanidermatum.


Pseudomonas fluorescens, Pythium aphanidermatum, Talc and Tobacco.

Subject Discipline

Agriculture Sciences

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