【摘要】 为探明苯醚菌酯与戊唑醇混剂对小麦赤霉病菌的联合毒力及对赤霉病、小麦籽粒DON毒素和白粉病的田间防效，开发防治赤霉病的新药剂，采用菌丝生长速率法分别检测了苯醚菌酯、戊唑醇及其11种配比混剂对赤霉病菌的毒力，并进行了最佳配比制剂的田间药效试验。结果表明，苯醚菌酯与戊唑醇配比为1:9时增效系数为2.0804，增效作用最显著。田间药效试验中，37%苯醚菌酯·戊唑醇SC 450 g/hm~2对赤霉病病指防效和DON防效分别为92.86%和89.49%,2次药后21 d对白粉病病指防效为85.84%，均高于常规药剂多菌灵和戊唑醇，并且对小麦生长安全。37%苯醚菌酯·戊唑醇SC对赤霉病和籽粒DON毒素防效优良，同时对白粉病兼治效果良好，可开发为赤霉病防治药剂。更多还原

【Abstract】 In order to exploit a new reagent for controlling fusarium head blight(FHB), the co-toxicity of mixtures of bemystrobin and tebuconazole to Gibberella zeae(Schw.) Petch and the field control efficacy of mixtures of bemystrobin and tebuconazole to FHB and DON in wheat grain and wheat powdery mildew(WPM)had been measured, respectively. The indoor toxicity of bemystrobin, tebuconazole and their eleven mixtures on G. zeae(Schw.) Petch had been detected by using mycelium growth rate method, and the field control tests of the optimum formulation had been conducted. The results of indoor toxicity tests showed that the mixture of bemystrobin and tebuconazole at the ratio of 1:9 with the synergistic coefficients of 2.0804 could provide most significant synergistic effect. The results of the field control efficacy showed that the FHB disease index(DI)and DON control efficacy of 37% bemystrobin · tebuconazole SC 450 g/hm~2were 92.86% and 89.49%,respectively, while the control efficacy against WPM DI on the 21thday after 2 times of spraying were 85.84%,both of which were higher than the control efficacy of the common fungicide carbendazim or tebuconazole, and it was safe for wheat growth. 37% bemystrobin·tebuconazole SC provided excellent control efficacy on FHB and DON in wheat grain, and provided good simultaneous control efficacy on WPM, which can be developed as a FHB control agent.更多还原