杀菌剂对柑橘溃疡病菌的毒力测定

Toxicity Test of Bactericides to Xanthomonas axonopodis pv. citri

为了筛选对柑橘溃疡病菌有强烈抑制作用的化学药剂,通过室内平皿菌落计数法,检测了70%氢氧化铜可湿性粉剂、20%噻菌铜悬浮剂、3%中生菌素可湿性粉剂、77%多宁可湿性粉剂和72%农用硫酸链霉素5种杀菌剂对柑橘溃疡病菌的抑制作用。毒力测定表明:70%氢氧化铜可湿性粉剂、20%噻菌铜悬浮剂、3%中生菌素可湿性粉剂、77%多宁可湿性粉剂和72%农用硫酸链霉素对柑橘溃疡病菌的EC50值分别为265.71、93.86、162.89、127.61、38.62μg/mL。根据EC50值分析,72%农用硫酸链霉素对柑橘溃疡病菌的室内抑制作用最强,20%噻菌铜悬浮剂次之,70%氢氧化铜可湿性粉剂的效果最差,其抑制作用为72%农用硫酸链霉素>20%噻菌铜悬浮剂>77%多宁可湿性粉剂>3%中生菌素可湿性粉剂>70%氢氧化铜可湿性粉剂。

Screening the effective bactericides to Xanthomonas axonopodis pv.citri is the main measure to control citrus canker（caused by Xanthomonas axonopodis）.The results of toxicity test showed that EC 50 of 70% Cupic Hydroxide WP,20% Thiodiazole-copper SC,3% Zhongshengmycin WP,77% Dodecylguanidine monoacetate WP,72% Streptomycin Sulfate to Xanthomonas axonopodis pv.citri were 265.71,93.86,162.89,1 27.61,38.62μg/mL,respectively.According to EC 50,the inhibitability to Xanthomonas axonopodis pv.citri was ranked as 72% Streptomycin Sulfate20% Thiodiazole-copper SC77%Dodecylguanidine monoacetate W P3% Zhongshengmycin WP70% Cupic Hydroxide WP.