海南3种芒果细菌性病害病原菌的抑菌药剂筛选OA

In order to screen effective agents for controlling three bacterial diseases of mango in Hainan,this study evaluated the in vitro toxicity of 13 tested agents(including 11 chemical agents and 2 biocontrol agents)against Xan-thomonas citri pv.mangiferaeindicae(bacterial black spot),Dickeya fangzhongdai(bacterial dieback)and Pantoea dispersa(bacterial necrosis)using the agar diffusion method.Preliminary screening indicated that five agents,benzio-thiazolinone,ethylicin,kasugamycin,tetracycline and zhongshengmycin,exhibited inhibitory activity against the three pathogens,with varying efficacy observed among the agents against the different bacteria.Pleuromutilin,benziothia-zolinone and ethylicin had the strongest inhibitory effect against X.citri pv.mangiferaeindicae,with EC50 values of 34.900‒39.151,69.498‒110.430,218.083‒399.371 μg/mL,respectively.D.fangzhongdai and P.dispersa demonstrated stronger resistance to the agents.Among them,ethylicin and benziothiazolinone were the most effective against D.fangzhongdai,with EC50 value of 678.652‒949.482 μg/mL and 722.494‒1228.298 μg/mL,respectively.For P.dispersa,ethylicin and pleuromutilin showed the best inhibitory effect,with EC50 value of 788.478‒1257.375 μg/mL and 922.843‒1302.518 μg/mL,respectively.This study systematically evaluated effective antibacterial agents for the three bacterial diseases in Hainan,identifying ethylicin and benziothiazolinone as the relatively effective agents against the newly reported disease(bacterial dieback).The findings would provide a basis for emergency control and scientific field application of pesticides targeting the diseases.