10种杀细菌剂对火龙果细菌性茎腐病菌的毒力测定

采用抑菌圈法，对10种杀细菌剂在火龙果茎腐病病原上进行了毒力测定。结果表明：72%农用硫酸链霉素可溶粉剂、53.8%氢氧化铜水分散颗粒剂（杜邦TM）、45%代森铵水剂、47%春雷?王铜可湿性粉剂、50%福美双可湿性粉剂和3%中生菌素可湿性粉剂对火龙果茎腐病病原均有一定抑制效果。其中，45%代森铵水剂和50%福美双可湿性粉剂防治效果较好，抑制率分别达到78.88%和71.42%，其直线回归方程分别为y=2.380 2.477x，y=2.896 1.146x，EC50分别为0.4929，0.0240。72%农用硫酸链霉素可溶粉剂效果次之，抑制率达到66.67%，直线回归方程为y=1.020 1.040x，EC50值为2.5686。这3种药剂可作为火龙果茎腐病田间药效试验的首选药剂。

Indoor Determination of 10 Bactericides Toxicity for Control of Dragon Fruit Stem Rot Disease

Ten bactericides were screened for Dragon fruit stem rot disease with methods of inhibition zone indoor. The results show that 72% Streptomycin sulfate SP, 53.8% Copper hydroxide WG (DUPOUTTM), 45% Ambam AS, 47% Kasugamycin & Colloidox WP, 50% Thiram WP and 3% Zhongshengmycin WP had certain effective to inhibit the pathogen of Dragon fruit stem rot disease. 45% Ambam AS and 50% Thiram WP had the best effect. The inhibitory rate was 78.88% and 71.42%, the linear regression equation was y=2.380 2.477x and y=2.896 1.146x, EC50 is 0.4929 and 0.0240. The second inhibitory was 72% Streptomycin sulfate SP, its inhibitory rate was 66.67%, and its linear regression equation was y=1.020 1.040x, EC50=2.5686. It is suggested that the three bactericidies were the first choose in field by dragon fruit stem rot disease.