The influence of bacterial suspension concentration on biocontrol efficacies and storage stabilities of three biocontrol agents, including Bacillus cereus AR156, Pantoea ananatisYT11 and Pseudomonas fluorescens ABc9, were studied. The results indicated that biocontrol efficacy and storage stability did not increase along with the enhancement of the concentration of biocontrol agents, and 109 CFU ml-1 of the strain P. fluorescensABc9, 108 CFU ml-1 of B. cereus AR156 and 108 CFU ml-1 of P. ananatis YT11 provided the best biocontrol efficacy as 63.06, 49.55 and 52.25% respectively, and the most suitable concentration of the biocontrol agents for preservation ranged from 108 to 109CFU ml-1.
Key words: Biological control, strain concentration, biocontrol efficacy, storage viability.
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