戊唑醇对苹果斑点落叶病菌及轮纹病菌的毒力和药效评价

采用菌丝生长速率法测定了戊唑醇对苹果斑点落叶病菌Alternaria mali和苹果轮纹病菌Physalospora piricola的毒力并进行了田间药效试验。室内测定结果表明:戊唑醇抑制苹果斑点落叶病菌菌丝生长的EC50和EC90值分别为0.034和0.587 μg/mL,抑制苹果轮纹病菌菌丝生长的EC50和EC90值分别为0.019 和0.394 μg/mL。43%戊唑醇悬浮剂61 ~86 mg/L(5 000 ~7 000倍液)对苹果斑点落叶病的防效为84.6% ~88.8%,108 ~143 mg/L(3 000 ~4 000倍液)对苹果轮纹病的防效为73.8% ~86.4%,且该药剂在本试验剂量范围内对苹果树安全。

Evaluation of Fungitoxicity of Tebuconazole against Alternaria mali and Physalospora piricola on Apple in Laboratory and in Field

Fungitoxicity of tebuconazole against Alternaria mali Roberts and Physalospora piricola Nose was assessed by mycelial growth rate method.And the field trial efficacy of 43% tebuconazole SC in controlling apple Alternaria blotch and apple ring rot was evaluated.The results showed that the EC50 and EC90 values of tebuconazle to A.mali were 0.034 and 0.587 μg/mL,and that to P.piricola were 0.019 and 0.394 μg/mL,respectively.The efficacy of 43% tebuconazole SC was 84.6% ~88.8% in controlling apple Alternaria blotch caused by A.mali at the rate of 61 ~86 mg/L (diluted by 5 000 ~7 000-fold),and that was 73.8% ~86.4% in controlling apple ring rot caused by P.piricola at the rate of 108 ~143 mg/L(diluted by 3 000 ~4 000-fold),respectively.The study also showed tebuconazole was safe to apple trees at the tested dosages.