杀菌剂对柑橘溃疡病菌的毒力测定

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、38.62 μg/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。

Toxicity Test of Bactericides to Xanthomonas axonopodis pv. citri

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.