不同杀菌剂对甜菜叶斑病菌毒力测定及田间防效分析

Determination of virulence and field efficacy of different fungicides against Cercospora beticola

【目的】研究不同杀菌剂及其复配剂对甜菜叶斑病菌的毒力大小及田间防效,为甜菜叶斑病的药剂防控提供参考。【方法】采用菌丝生长速率法,对12种杀菌剂进行甜菜叶斑病菌毒力测定,并对不同药剂及其复配剂进行田间防效分析。【结果】40%氟硅唑对甜菜叶斑病菌毒力最强,EC50值为0.13μg/mL;45%三苯基乙酸锡+37%苯醚甲环唑1∶1复配剂增效最强,共毒系数为137.17。45%三苯基乙酸锡+37%苯醚甲环唑1∶1复配剂、50%吡唑醚菌酯+45%三苯基乙酸锡1∶1复配剂和40%氟硅唑田间防效分别为78.91%、77.86%、77.31%,防治效果明显。【结论】45%三苯基乙酸锡+37%苯醚甲环唑1∶1复配剂、50%吡唑醚菌酯+45%三苯基乙酸锡1∶1复配剂和40%氟硅唑对甜菜叶斑病有良好防治效果。

【Objective】Examine the virulence and field efficacy of several fungicides and their combinations against Cercospora beticola to guide the management of beet leaf spot disease.【Methods】The mycelial growth rate method was used to assess the virulence of 12 fungicides against Cercospora beticola.The field efficacy of various fungicides and their combinations were examined.【Results】40%flusilazole was the most virulent against Cercospora beticola with EC50 value of 0.13μg/mL.With a co-toxicity coefficient of 137.17,the combination consisting of 45%fentin acetate+37%difenoconazole 1∶1 compound had the strongest synergistic effect.The field efficacy of 45%fentin acetate+37%difenoconazole 1∶1 compound,50%pyrazole ether fungus ester+45%fentin acetate 1∶1 compound and 40%flusilazole were 78.91%,77.86%and 77.31%,respectively,with good control effect.【Conclusion】Beet leaf spot was well controlled by 45%fentin acetate+37%difenoconazole 1∶1 compound,50%pyrazole ether fungus ester+45%fentin acetate 1∶1 compound,and 40%flusilazole.