40%氟菌•唑醚悬浮剂的研制及其对马铃薯晚疫病田间防治效果

doi:10.3864/j.issn.0578-1752.2013.15.008

摘要/Abstract

摘要： 【目的】筛选对致病疫霉（Phytophthora infestans）抑菌活性高的杀菌剂氟吡菌胺和吡唑醚菌酯的最佳混配比例，将其加工成悬浮剂（suspension concentrate，SC）并确定其在田间对马铃薯晚疫病的防治效果。【方法】采用叶盘法测定氟吡菌胺和吡唑醚菌酯的不同配比混合物对致病疫霉的毒力并根据Wadley公式计算增效系数，选择具有增效作用的混配组合；采用流点法、黏度曲线法确定润湿分散剂，通过“湿法”研磨工艺加工不同助剂含量的样品，调节样品的流变学特性，逐步优化配方；确定最终配方后，采用“湿法”研磨工艺加工悬浮剂样品，测定其对马铃薯晚疫病的田间防治效果。【结果】氟吡菌胺和吡唑醚菌酯以10﹕1和1﹕4混合时对致病疫霉毒力表现增效，增效系数分别为1.56和1.66；40%氟菌•唑醚悬浮剂的最佳配方为：氟吡菌胺≥8%、吡唑醚菌酯≥32%、1%Terwet1004、2%Tersperse2700、2%Morwet D425、0.5%硅酸镁铝、4%乙二醇、3%SAG630、水≤47.5%；在用量为480、360、288 g a.i./hm2时，40%氟菌•唑醚悬浮剂对马铃薯晚疫病的田间防治效果分别为94.38%、92.20%、88.22%。【结论】氟吡菌胺和吡唑醚菌酯混配使用对致病疫霉具有不同程度的毒力增效作用；按照选定的配方加工成的40%氟菌•唑醚悬浮剂样品粒径小，悬浮率高，贮存稳定，在田间条件下对马铃薯晚疫病有优异的防治效果。

关键词: 40%氟菌&bull, 唑醚悬浮剂 , 配方筛选 , 马铃薯晚疫病 , 田间防治效果

Abstract: 【Objective】 The objective of this study is to screen the optimum ratio of the mixtures of fluopicolide and pyraclostrobin which has a high inhibitory activity to Phytophthora infestans and processed it into aqueous suspension concentrate (SC), and to evaluate the control efficacy of the SC sample to potato late blight in the field. 【Method】 The inhibitory activity of the mixtures of fluopicolide and pyraclostrobin at different mixing ratios against P. infestans was determined by leaf disc test and the synergistic ratios were calculated according to Wadley formula. The combination with higher synergistic interactions was screened and wetting-dispersing agents were selected by flowing point test and viscosity curve. The samples with different contents of adjuvants were processed by wet grinding. The rheological feature of the samples was adjusted and the formulation was optimized step by step. The sample was processed by wet grinding and the control efficacy was tested to potato late blight in the field after the final formula was determined.【Result】 Synergistic interactions against P. infestans of the mixtures of fluopicolide (F) and pyraclostrobin (P) were found at the ratio of 10﹕1 and 1﹕4 (F﹕P) and the synergism ratios were 1.56 and 1.66, respectively. The optimal formulus of 40% fluopicolide•pyraclostrobin SC was established as follows: fluopicolide≥8%, pyraclostrobin≥32%, 1% Terwet1004, 2% Tersperse2700, 2% Morwet D425, 0.5% magnesium aluminosilicate, 4% glycol, 3% SAG630, water≤47.5%. The control efficacy of the sample of 40% fluopicolide•pyraclostrobin SC applied at the doses of 480, 360, and 288 g a.i./hm2 against potato late blight in the field was 94.38%, 92.20%, and 88.22%, respectively. 【Conclusion】 Fluopicolide and pyraclostrobin used in combinations had synergistic interactions against P. infestans in some degree. The sample of 40% fluopicolide•pyraclostrobin SC was processed based on the selected formula had small particle size, high suspensibility and good storage stability and exhibited excellent efficacy in controlling potato late blight in the field.

Key words: 40% fluopicolide•pyraclostrobin SC , formulus screening , potato late blight , controlling efficacy in the field

张鹏12, 王文桥1, 黄啟良2, 孟润杰1, 赵建江1, 马志强1, 韩秀英1, 张小风1. 40%氟菌•唑醚悬浮剂的研制及其对马铃薯晚疫病田间防治效果[J]. 中国农业科学, 2013, 46(15): 3142-3150.

ZHANG Peng-12, WANG Wen-Qiao-1, HUANG Qi-Liang-2, MENG Run-Jie-1, ZHAO Jian-Jiang-1, MA Zhi-Qiang-1, HAN Xiu-Ying-1, ZHANG Xiao-Feng-1. Development of 40% Fluopicolide•Pyraclostrobin Suspension Concentrate and Its Controlling Efficacy to Potato Late Blight in the Field[J]. Scientia Agricultura Sinica, 2013, 46(15): 3142-3150.

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