[Objective]The influences of organic silicone surfactant Tech- 408 and Fairland2408 on deposition coverage areas of pesticide droplets on tobacco leaf surfaces were studied to find a new way to increase the efficiency and efficacy of foliar spray applications. [Method] The 340 - 360 μm droplet evaporation times and deposition coverage areas on tobacco leaves were measured by sequential images after 10% imidacloprid liquid was diluted to 3 000 times with water and organic silicone surfactants Tech-408, Fairland2408 and Nongru 500 # were added. The influences of pesticide mixtures with the organic silicone surfactant Tech- 408 and Fairland2408 on droplet deposition coverage areas were studied. [Result]The deposition coverage areas of pesticide droplets changed with different surfactants. The developing multiples of the deposition coverage areas of pesticide droplets on three tobacco leaves were 8.1, 6. 4 and 1. 2 times, respectively, when 0.03% of Tech-408, Fairland2408 and Nongru 500 # were added. The deposition coverage areas of pesticide droplets changed obviously with different adding proportions of surfactants. The deposition coverage areas of pesticide droplets on 'T66' tobacco leaves increased by 39.8%, 156.1% and 53.3%, respectively, when adding proportions of Tech-408, Fairland2408 and Nongru 500 # surfactants increased from 0.03% to 0.1%. [Conclusion] The influences of organic silicone surfactants Tech-408 and Fair-land2408 and their adding proportions on deposition coverage areas of pesticide droplets on tobacco leaf surfaces were significant.%[目的]研究有机硅表面活性剂Tech-408和Fairland2408对农药雾滴在烟草叶片上覆盖面积的影响,寻找提高农药使用效率的途径.[方法]将10％吡虫啉乳油稀释3 000倍,分别加入有机硅表面活性剂Fairland2408和Tech-408以及农乳500#后,采用连续拍摄的方法,测试直径范围为340～360 μm单个雾滴在‘NC471,、‘云110,和‘T66'3种烟叶片上的蒸发时间和覆盖面积,重点研究Fairland2408和Tech-408对药液雾滴在烟草叶片上覆盖面积的影响规律.[结果]表面活性剂不同,雾滴覆盖面积的扩展程度也不同.当Tech-408、Fairland2408和农乳500#的添加比例为0.03％时,雾滴覆盖面积在上述3种烟叶片上扩展的平均倍数分别为8.1、6.4倍和1.2倍.表面活性剂添加比例不同,其对农药雾滴覆盖面积的影响程度也明显不同.随着Tech-408、Fairland2408和农乳500#的添加比例从0.03％增加到0.1％,雾滴在‘T66’烟叶片上覆盖面积分别增大了39.8％、156.1％和53.3％.[结论]有机硅表面活性剂Tech-408和Fairland2408和其添加比例均对吡虫啉在烟叶上的雾滴覆盖程度有明显影响.
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