Abstract
Comparative investigation was taken among several antibacterial screening methods for controlling bacterial leaf blight of rice plant caused by Xanthomonas oryzae with 5 chemicals applying nowadays. In the agar dilution method, the agar diffusion method and the turbidimetric method, Phenazine-5 N-oxide, Cellocidin and Chloramphenicol were remarkably effective, whereas, Ni-bis-dimethyldithiocarbamate was a little effective, and Fentiazon was not observed the antibacterial activity in these tests. In rice seedling screening methods, the high protective effects of these five chemicals were observed by 3 kinds of method, which were needle inoculation, bacterial exudation, and spray inoculation methods. The results were concluded that the method of spraying chemicals immediately after needle inoculation was preferable as primary screening test and the other methods might be applied as secondary screening test.
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