喷雾助剂改善22%氟啶虫胺腈悬浮剂物理性能及减量增效作用

为探索喷雾助剂改善22%氟啶虫胺腈SC物理性能及减量增效作用?选取Silwet 636?Silwet 806?Silwet Fusion和Agrospred 960等4种喷雾助剂, 在室内条件下, 测定其对22%氟啶虫胺腈SC表面张力?与叶面接触角的影响, 并进行了田间防效对比?结果表明, 4种喷雾助剂均显著降低了氟啶虫胺腈药液的表面张力和与叶面的接触角?其中Silwet 636综合性能表现最好, 与常规对照相比, 其表面张力显著下降35.81%, 测定20 s时, 与叶面接触角显著减小了86°?田间试验表明, 在推荐剂量下(180 mL/hm 2), 添加4种喷雾助剂的各处理在药后不同天数, 除Silwet Fusion于药后7 d的防效低于推荐剂量单剂处理, 其余处理的防效均高于推荐剂量单剂处理的效果; 减药30%(126 mL/hm 2)情况下, 除Silwet Fusion于药后3?7?10?14 d防效低于推荐剂量单剂处理, 添加Agrospred 960于药后5 d显著高于对照, Silwet 636分别于药后5?7?10?14 d均显著高于对照, Silwet 806于药后3?5?7?10 d和14 d较推荐剂量单剂处理分别显著高29.10%?44.81%?57.67%?117.42%和228.71%; 减药50%(90 mL/hm 2)情况下, 4种喷雾助剂的防效表现为Silwet 806>Silwet 636>Agrospred 960>Silwet Fusion, 且添加Silwet 806于0~10 d可达到推荐剂量单剂处理的防治效果, 但14 d则显著低于对照?综合考虑, 22%氟啶虫胺腈SC在田间药剂量降低30%, 减药为126 mL/hm 2水平下添加Silwet 806为最佳组合?

Improving physical properties of sulfoxaflor 22% SC by adding spray adjuvants and their dose-decrease and effect-enhancing effects

In order to explore the spray additives functions to improve the physical properties of sulfoxaflor 22% SC and reduce pesticides while increasing effectiveness, four spray additives, including Silwet 636, Silwet 806, Silwet Fusion and Agrospred 960, were selected to measure their indoor effects on the surface tension and the contact angle with the leaf surface of the sulfoxaflor 22% SC. Meanwhile, field control effects were also investigated. Results showed that the four spray additives significantly reduced the surface tension and contact angle of the sulfoxaflor 22% SC, and Silwet 636 had the best overall performance. Compared with conventional control, Silwet 636 helped to reduce surface tension significantly by 35.81%. At 20 s after measure, the contact angle with the leaf surface was significantly reduced by 86°. Field trials demonstrated that at the recommended dose (180 mL/hm 2), the control efficacies with four spray additives added on different days after pesticides spray were all higher than those of the single agent at the recommended dose, except that efficacy of Silwet Fusion at 7 d was less than that of the single agent. When pesticide was reduced by 30% (126 mL/hm 2), except that efficacy of Silwet Fusion was less than that of the single-agent at the recommended dose on 3, 7, 10 and 14 days after treatment. The efficacy of Agrospred 960 was significantly higher than those of the control group at 5 d, and the efficacy of Silwet 636 was significantly higher than that of the control group 5, 7, 10 d and 14 d after treatment.Efficacy of Silwet 806 on 3, 5, 7, 10 d and 14 d was significantly higher than that of the single-agent at the recommended dose by 29.10%, 44.81%, 57.67%, 117.42% and 228.71%, respectively. When pesticide was reduced by 50% (90 mL/hm 2), the control efficacies of the four spray additives were ranked as Silwet 806> Silwet 636> Agrospred 960> Silwet Fusion, and adding Silwet 806 0-10 d after treatment can achieve the control effect of the single agent at the recommended dose, but significantly lower than that of the control group at 14 d. Considering comprehensively, the best combination is the field dose of 22% sulfoxaflor SC reduced by 30% adding Silwet 806 at the level of 126 mL/hm 2.