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采用离体叶段法,分别测定了从河北、河南、湖北、陕西和四川5省分离的53个小麦白粉病菌单孢菌株对苯菌酮和喹氧灵的敏感性,并分析了白粉病菌对三唑酮和苯菌酮以及喹氧灵之间的交互抗性。结果表明:小麦白粉病菌群体对苯菌酮和喹氧灵的平均EC50值分别为(0.001 9±0.000 6)和(0.013 1±0.002 0)mg/L,苯菌酮比喹氧灵具有更高的抑菌活性;小麦白粉病菌对三唑酮和苯菌酮与喹氧灵之间均不存在交互抗性(R2值分别为0.102 6和0.491 9);室内盆栽试验结果显示:接种前1 d和接种后1 d施药,苯菌酮和喹氧灵对小麦白粉病的保护与治疗作用防效分别为92.21%、84.25%和82.43%、70.25%,表明这2种药剂不仅具有优异的保护作用,同时还具有较好的治疗作用。
Fifty-three isolates of powdery mildew from wheat isolates from Hebei, Henan, Hubei, Shaanxi and Sichuan provinces were tested for their susceptibility to meclofenamic and quinolone using leaf segments exclusion method. Cross-resistance between triadimefon and metracone and quinolone. The results showed that the average EC50 values of mefenamic acid and meclofenamic acid were (0.001 9 ± 0.000 6) and (0.013 1 ± 0.002 0) mg / L, respectively, and that of metracone was higher than that of quinolone The results showed that there was no cross-resistance to powdery mildew in both triadimefon and metyrapone and quinolone (R2 = 0.102 6 and 0.491 9, respectively) And 1 d after inoculation, the preventive and therapeutic effects of metracone and quinolone on wheat powdery mildew were 92.21%, 84.25% and 82.43%, 70.25%, respectively, indicating that these two agents not only have excellent protection Role, but also has a good therapeutic effect.