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[目的]通过室内生物活性的比较,筛选出有效防控玉米大斑凸脐蠕孢菌侵染所引起的玉米大斑病的新药剂及其混剂。[方法]采用菌丝生长速率法、温室幼苗盆栽法。[结果]在离体药剂筛选试验中,咪鲜胺、苯醚甲环唑、丙环唑EC50值分别为0.000 3、0.029 9、0.084 0 mg/L;在温室幼苗盆栽单剂筛选试验中,苯醚甲环唑、丙环唑EC90值分别为14.29、35.25 mg/L;在幼苗盆栽混剂筛选试验中,苯醚甲环唑与唑菌酯质量比为3∶1时对玉米大斑病防效较好,EC90值为15.26 mg/L,共毒系数为129.90,具有增效作用。[结论]所筛选的苯醚甲环唑及其增效混剂对玉米大斑病有很好的防治效果,可作为防治玉米大斑病的有效药剂。
[Objective] The aim of the research was to screen out new agents and their mixtures which can effectively prevent and control corn leaf spot disease caused by the infection of Malasia maculata. [Method] The method of mycelial growth rate was used to study the greenhouse seedling pot method. [Result] The results showed that the EC50 values of prochloraz, difenoconazole and propiconazole were 0.000 3, 0.029 9 and 0.084 0 mg / L respectively in the in vitro drug screening test. In the single-agent screening test of greenhouse seedlings, Difenoconazole and difenoconazole EC90 values were 14.29,35.25 mg / L respectively; in the seedling pot mixture screening test, the ratio of difenoconazole and pyraclostrobin was 3:1, The control effect is better, EC90 value is 15.26 mg / L, the co-toxicity coefficient is 129.90, with synergistic effect. [Conclusion] The selected difenoconazole and its synergistic mixture had a good control effect on the maize leaf spot and could be used as an effective agent for controlling the maize leaf spot.