小麦白粉病菌对喹氧灵和苯菌酮的敏感基线及药剂的生物活性
Baseline sensitivity of Blumeria graminis f.sp.tritic to metrafenone, quinoxyfen and bioactivitives of these fungicides
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摘要: 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1d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。Abstract: The sensitivity of 53 Blumeria graminis f.sp.tritic(Bgt) strains to metrafenone and quinoxyfen were determined by leaf segment assay.The results showed that the mean EC50 values is (0.001 9±0.0006) mg/L for metrafenone and (0.013 1±0.002) mg/L for quioxyfen;The sensitivity of Bgt to metrafenone was significantly lower than that of quinoxyfen,suggesting metrafenone has higher intrinsic activity on Bgt;Tradimefon showed no cross-resistance with metrafenone and quinoxyfen(R2=0.102 6,0.491 9,respectively).The curative and preventive activities of the two fungicides on Bgt in wheat were evaluated.With metrafenone and quinoxyfen fungicides treatments 1 days after inoculation and 1 days before inoculation,the efficacy of preventive and curative efficacy of the two fungicides were 92.21% and 84.25%,82.43% and 70.25%,respectively.Suggesting both fungicides had good curative and preventive properties.
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