Bayer AG, Monheim, Germany.
Bayer CropScience K K, Japan.
Pest Manag Sci. 2024 Feb;80(2):220-234. doi: 10.1002/ps.7707. Epub 2023 Nov 20.
Unmanned aerial systems (UAS) are providing interesting disruptive solutions for spray application of crop protection products with very-low spray volumes (VLV) down to 8 L/ha that offer improved sustainability through reduced water volumes and reduced soil compaction. However, the efficacy of products can be reduced by the significantly lower crop/plant spray coverage and formulation designs that can compensate for this are highly important here.
Suspension Concentrate (SC) formulations designed for VLV use containing and delivering low dose rates (g/ha) of organosilicone alkoxylate high-spreading surfactants were found to result in leaf coverage of VLVs comparable to those observed at higher spray volumes. High spreading was observed on textured leaf surfaces containing sub-micron sized epicuticular wax crystals. Greenhouse fungal disease studies showed enhanced efficacy with these SC formulations compared to standard SC formulations without these additives and maintained the observed increase in efficacy when applied at VLV. Alternatively, SC formulations without high spreading formulants but containing uptake promoting nonionic surfactants showed enhanced cuticle penetration through isolated cuticles at VLV in comparison to higher spray volumes, with coffee-ring spray deposit microstructures present at VLVs. Similarly, greenhouse studies showed enhanced efficacy that was maintained at VLV relative to SCs without these additives.
At VLVs, SC formulations applied at relatively low dose rates (g/ha) of formulants (adjuvants) enhancing spreading on the leaf surface and/or uptake of the active ingredient(s) maintained good spreading, uptake and biological efficacy in greenhouse studies overcoming the coverage limitations of SC formulations without these additives. This result is unexpected considering the low dose rate of adjuvants used. © 2023 Bayer AG. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
无人机系统 (UAS) 为植保产品的超低容量喷雾（VLV）提供了非常有趣的颠覆性解决方案，喷雾量低至 8 升/公顷，通过减少用水量和减少土壤压实来提高可持续性。然而，产品的功效可能会因作物/植物的喷雾覆盖率显著降低而降低，因此，补偿这种情况的配方设计非常重要。
发现设计用于 VLV 使用的悬浮浓缩 (SC) 配方，含有并输送低剂量率（g/公顷）的有机硅烷氧基化物高扩展表面活性剂，可导致 VLV 的叶片覆盖率与在更高喷雾量下观察到的覆盖率相当。在含有亚微米大小的表皮蜡晶体的纹理叶片表面上观察到高扩展。温室真菌病害研究表明，与不含这些添加剂的标准 SC 配方相比，这些 SC 配方具有更高的功效，并且当以 VLV 施用时保持观察到的功效增加。或者，不含高扩展配方但含有促进吸收的非离子表面活性剂的 SC 配方在 VLV 下与较高喷雾量相比，通过隔离的角质层穿透显示出增强的角质层穿透性，在 VLV 存在咖啡环喷雾沉积物微观结构。同样，温室研究表明，与不含这些添加剂的 SC 相比，在 VLV 下保持了较高的功效。
在 VLV 下，以相对较低的制剂（助剂）剂量率（g/公顷）施用 SC 配方，可增强叶面扩展和/或活性成分的吸收，从而在温室研究中保持良好的扩展、吸收和生物功效，克服了没有这些添加剂的 SC 配方的覆盖限制。考虑到助剂的低剂量率，这一结果出乎意料。 © 2023 拜耳公司。由 John Wiley & Sons Ltd 代表化学工业协会出版的《害虫管理科学》。
