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采用菌丝生长速率法和孢子萌发法测定了25%吡唑醚菌酯乳油对苹果斑点落叶病病菌和苹果轮纹病病菌的毒力,并进行了田间药效试验。结果表明,25%吡唑醚菌酯乳油对苹果斑点落叶病病菌菌丝生长和孢子萌发的EC50分别为0.176 3、0.275 5μg/mL;对苹果轮纹病病菌菌丝生长和孢子萌发的EC50分别为0.033 3、0.602 9μg/mL;第4次施药后16天,25%吡唑醚菌酯乳油1 500、2 000、2 500倍液对苹果斑点落叶病的防效为96.72%～98.69%,采收后30天对苹果轮纹病的防效为93.17%～99.15%,显著或明显好于43%戊唑醇悬浮剂3 000倍液和80%代森锰锌可湿性粉剂700倍液。
The mycelial growth rate method and spore germination method were used to determine the virulence of 25% pyraclostrobin against apple spot blight and apple ring rot disease and the field efficacy test was conducted. The results showed that EC50 of 25% pyraclostrobin EC on mycelial growth and spore germination of Alternanthera philoxeroides was 0.176 3 and 0.2775 5 μg / mL, respectively. EC50 of mycelial growth and spore germination of apple rings rot disease Was 0.033 3,0.602 9μg / mL. After 16 days of the fourth application, the control effect of 25% pyraclostrobin emulsifiable concentrate 1 500,2 000,2 500 times against apple spotted leaf decay was 96.72% -98.69% , 30 days after harvest on the apple ring disease control effect was 93.17% ~ 99.15%, significantly or significantly better than 43% tebuconazole 3 000 times the suspension and 80% mancozeb WP 700 times .