Abstract: Ag/TiO₂ was modified by stearic acid to change its surface from hydrophilic to hydrophobic.Chlorfenapyr pesticide，modified Ag/TiO₂ and corresponding additives were mixed to fabricate a nano-pesticide formulation. The particles had uniform size, and the mean diameter was about 100 nm. The photodegradation experiment of chlorfenapyr nano-pesticide formulation proved that the preparation was stable in darkness, while the decomposition rate was 15.8％ with in lighted room after l5 days, and 69.0％ with irradiation under sunlight after 3 days.With irradialtion by UV-light for 22.5 h, the decomposition rate of nano-formulation was more than 9.2 times that of normal formulation. The indoor and field virulence experiments of chlorfenapyr nano-pesticide formulation indicated that nano-formulation had stronger virulence than normal formulation.The LC₅₀ was 8.95 mg•L^-1, more than 1.77 times that of EC virulence. Under the condition of half pesticide dosage in the comparative experiment of pesticide protection, the effect of preventing from cabbage Spodoptera litura F. was better than chlorfenapyr EC.
After using pesticide 1 day and 3 days，corrected protection effect of pesticide was higher by 4.89％ and 3.05％ respectively.The remnant pesticide experiments of soil and plants indicated that the decomposition of nano-formulation in cabbage and soil was quicker, and the t_1/2 was 3.91 and 1.27 days respectively. While the t_1/2 of chlorfenapyr SC was 8.64 and 3.27 days respectively.

摘要： 用硬脂酸对Ag/TiO₂表面进行了改性，其表面由亲水性变为亲油性.将溴虫腈农药、改性Ag/TiO₂和相应的添加剂混合制成颗粒分布较均匀、平均粒径约为100 nm的纳米农药制剂.溴虫腈纳米制剂光降解实验表明，在黑暗中稳定，在有光线的室内放置15 d的分解率为15.8%，在太阳光直射下放置3 d的分解率为69.0%.紫外光照22.5 h时，纳米制剂分解率是常规制剂的9.2倍.溴虫腈纳米制剂室内、田间毒力试验表明，纳米制剂比常规制剂具有更强的毒力，其LC₅₀为8.95 mg•L^-1，是乳油毒力的1.77倍.在田间药效对比试验中，施药剂量减少一半条件下，纳米制剂防治甘蓝斜纹夜蛾的田间防效优于溴虫腈乳油，药后1 d和3 d的校正防效分别高出4.89和3.05个百分点.土壤、植物的残留试验表明，纳米制剂在甘蓝、土壤中的消解较快，其t_1/2分别为3.91 d和1.27 d，而溴虫腈SC的t_1/2分别为 8.64 d和3.27 d.