Pathogen Identification of Radish Black Rot and Fungicides Screening in Laboratory
A serious radish rot was found in the field of Tianjin.5 bacterial isolates were isolated from diseased radish tissues.In order to provide reference for the diagnosis and prevention of this disease,pathogen identification was carried out using morphology,pathogenicity test and moleculer identification,and the toxicities of 20 kinds of bactericides were tested by inhibition zone method.The results showed that the pathogen was identified as Xanthomonas campestris pv.campestris.Antibacterial activity differed among the different agents.Among 20 kinds of the tested agents,13 agents had antibacerial effects on Xanthomonas campestris pv.campestris,of which 0.3％tetramycin aqueous solutions and 80％ethylicin emulsifiable concentrate were more effective than 98％streptomycin sulphate TC.7 agents,including 27.12％copper dihydroxosulphate suspension concentrate,had no inhibitory action.
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