Effect of pseudomonas fluorescence , p . aeruginosa and bacillus subtilis a s biocontrol agent for crop protection

Pseudomonas fluorescence, P. aeruginosa and Bacillus subtilis are the beneficial rhizobacteria possessing biocontrol activity against plant pathogenic fungus. In present research the biocontrol effect of P. fluorescence, P. aeruginosa and B. subtilis were evaluated on the seedling growth of Cotton (Gossypium arboretum L.), Castor (Ricinus communis L.), Peanut (Arachis hypogaea L.) and Mung bean (Vigna radiate (L.) R. Wilczek) challenged by plant pathogenic fungus viz. Fusarium oxysporum, Aspergillus niger and Alteneria alternate. The antagonist activity of all three bacteria against pathogenic fungus was evaluated in in vitro condition on solidified medium. The most active fungus inhibitor was P. aeruginosa, than P. fluorescence and least was B. subtilis. In plant inoculation study, the seeds were treated with pathogenic fungus as well as P. fluorescence, P. aeruginosa and B. subtilis respectively. The shoot and root length were measured as growth parameters after tenth day of the germination. P. fluorescence has shown the highest growth promoting effect, followed by P. aeruginosa and least was of B. subtilis. The most positive response was observed with P. fluorescence in Caster seedlings and the least effect was observed with Peanut seedlings. All three bacterial species can be use as potential biopesticides for economical plants of Gujarat.