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

摘要

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.