Abstract
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.
Highlights
Biological control using microbial antagonists has attracted much interest as an alternative to chemical methods of controlling pre- and post-harvest plant pathogens and pests of agricultural and horticultural crops, which can give a good environmental compatibility, non-toxic harmless advantage (Janisiewicz, 1988; Wilson and Chalutz, 1989).For practical use, microbial agents must be formulated as products capable of storage, distribution and application in agricultural marketplace, requiring different approaches from traditional agrochemical product design (Rodham et al, 1999)
Bacillus cereus AR156, Pantoea ananatis YT11 and Pseudomonas fluorescens ABc9 were biocontrol agents selected to control root-knot nematode caused by Meloidogyne incognita, bacterial wilt caused by Ralstonia solanacearum on tomato, cucumber and some other plants in our previous work and unpublished data
When the strain concentrations of B. cereus AR156 and P. ananatis YT11 were 106-108 CFU ml-1, and P. fluorescens ABc9 was 106-109 CFU ml-1, the biological efficacies of three biocontrol agents had a positive trend with the increasing concentration (Table 1)
Summary
Biological control using microbial antagonists has attracted much interest as an alternative to chemical methods of controlling pre- and post-harvest plant pathogens and pests of agricultural and horticultural crops, which can give a good environmental compatibility, non-toxic harmless advantage (Janisiewicz, 1988; Wilson and Chalutz, 1989).For practical use, microbial agents must be formulated as products capable of storage, distribution and application in agricultural marketplace, requiring different approaches from traditional agrochemical product design (Rodham et al, 1999). One of the most important factors is the strain concentration used for biological control and conserved for storage. Few studies have been carried out to evaluate the impact of the strain concentration on the biocontrol efficacies and storage stabilities of biocontrol agents.
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