Studies on compatibility and efficacy of bioagents with organic amendments in suppressing cumin wilt caused by Fusarium oxysporum f. sp. cumini.

摘要

Increasing awareness towards environment has re-emphasized the urgency of biological management of cumin wilt. Therefore, an investigation was conducted under green house condition by using fungal and bacterial bioagents in conjunction with organic amendments. The effect of organic amendments of vermicompost and mustard cake on disease control efficacy of four combinations of bioagents viz., Trichoderma harzianum+Pseudomonas fluorescens, Trichoderma viride+P. fluorescens, T. harzianum+Bacillus subtilis and T. viride+B. subtilis applied as seed treatment @ 3+3 g/kg seed was tested against Fusarium oxysporum f. sp. cumini. Seed treatment with talc based formulations of T. harzianum+P. fluorescens and T. viride+P. fluorescens provided excellent control of pathogen. These bioagents suppressed the pathogen population in soil and also enhanced the shoot, root lengths and dry weight of cumin plant. Disease incidence as well as pathogen population in soil were significantly reduced due to seed treatment with bioagents and simultaneous application of organic amendments. These treatments also led to considerable increase in shoot, root lengths and dry weight of cumin plant. The biocontrol potentiality of T. harzianum+P. fluorescens and T. viride+P. fluorescens was relatively better in presence of mustard cake. While disease control due to seed treatment with T. viride+P. fluorescens or T. harzianum+P. fluorescens was similar in presence of vermicompost.