Biological control of fungal wilt of tomato by plant growth promoting rhizobacteria and Trichoderma harzianum
Keywords:
plant growth promoting rizhobacteria, Azotobacter sp., Azospirillum sp., Trichoderma harzianum, Verticillium dahlia, Fusarium oxysporum f.sp. lycopersici, fungal wilt disease of tomato.Abstract
The efficacy of plant growth promoting bacteria i.e. (Bacillus subtilis, Bacillus polymyxa, Bacillus megaterium, Pseudomonas fluorescence, Azotobacter sp., Azospirillum sp. and the fungus Trichoderma harzianum were studied as bioagents for controlling Fusarium oxysporum f.sp. lycopersici and Verticillium dahliae the causing wilt disease of tomato. The results of antagonistic activity of the PGP bacteria against Fusarium oxysporum f.sp. lycopersici and Verticillium dahliae in vitro  exhibited higher variation in their abilities to reducing the growth rate of the pathogen and increasing the percentage of pathogen inhibition as compared with the control treatment. Also, the obtained results showed that Trichoderma harzianum I, Pseudomonas fluorescens and Bacillus subtilis gave the best results for controlling Verticillium dahliae and Fusarium oxysporum f.sp. lycopersici. Under greenhouse conditions, the inoculated tomato seedling with a mixture of (Azotobacter sp+ Azospirillum sp.+ B. megaterium var. phosphaticum + B. subtilis+ B. polymyxa +Pseudomonas fluorescence+ T. harzianum I showed the least percentage of infection as compared with the bioagent treatments individually.Â
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