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[目的]测定噻呋酰胺与咯菌腈防治水稻纹枯病的最佳复配比例。[方法]采用盆栽法评价噻呋酰胺、咯菌腈及各配比对水稻纹枯病的防效,用孙云沛法评价各配比的增效作用。[结果]噻呋酰胺与咯菌腈1:1和1:4时EC50值分别为13.74、13.9 mg/L,CTC值分别为163.98和187.67,增效明显。综合考虑药效和成本,选择噻呋酰胺与咯菌腈1:1制成25%噻呋酰胺·咯菌腈SC,田间试验表明,在60 g a.i./hm2剂量下对水稻纹枯病的防效为90.6%,优于对照药剂噻呋酰胺和井冈霉素。[结论]噻呋酰胺与咯菌腈混配对水稻纹枯病有优异的防效,值得推广应用。
[Objective] The optimal proportion of thifluzamide and fludioxonil to control rice sheath blight was determined. [Method] The pot experiment was conducted to evaluate the control effect of thifluzamide and fludioxonil and their proportions on rice sheath blight. The synergistic effect of each ratio was evaluated by Sun Yunpei method. [Result] The EC50 values of thifluzamide and fludioxonil at 1: 1 and 1: 4 were 13.74 and 13.9 mg / L respectively, and the CTC values were 163.98 and 187.67, respectively. The synergism was obvious. Taking into account the efficacy and cost, we selected thifluzamide and fludioxonil 1: 1 to make 25% thifluzamide fludioxonil SC. Field experiments showed that the control of rice sheath blight at 60 g ai / hm2 Effectiveness of 90.6%, better than the control agent thifluzamide and Jinggangmycin. [Conclusion] The combination of thifluzamide and fludioxonil has excellent control effect on rice sheath blight, which is worth popularizing and applying.