Innovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, China.
Key Laboratory of National Forestry and Grassland Administration on Pest Chemical Control, China Agricultural University, Beijing, China.
Pest Manag Sci. 2024 Mar;80(3):1632-1644. doi: 10.1002/ps.7895. Epub 2023 Dec 5.
Suspension concentrate (SC) is one of the most widely used formulations for agricultural plant protection. With the rapid development of unmanned aerial vehicle (UAV) plant protection, the problems of spray drift, droplet rebound and poor wettability in the application of SC from UAVs have attracted wide attention. Although some tank-mix adjuvants have been used to enhance dosage delivery for UAV, their effects and mechanisms are not fully clear, and few formulations are specifically designed for UAV.
The type and concentration of tank-mix adjuvant affect the dosage delivery of SC. MO501 can significantly reduce DV , and inhibit droplet rebound on peanut leaves at concentrations ≥0.5%. Silwet 408 can achieve complete wetting and superspreading after adding ≥0.2% concentrations, but only ≥0.5% can inhibit rebound. XL-70 shows excellent regulation ability even at low concentration, and 0.2% concentration can simultaneously suppress impact and promote spreading. Besides, the formulation oil dispersion (OD) can significantly reduce the driftable fine fraction and inhibit rebound at dilution ratios of ≤250-fold, thus enhancing dosage delivery.
SC is prone to rebound on hydrophobic leaf surfaces and shows poor wetting and spreading properties. Appropriate types and concentrations of tank-mix adjuvants and formulation improvement are two effective strategies for improving the dosage delivery of pesticides, whereas the addition of inappropriate adjuvants may cause potential risks instead. These findings provide guidance for the rational selection of tank-mix adjuvants and potential applications of OD for UAV plant protection. © 2023 Society of Chemical Industry.
悬浮浓缩剂（SC）是农业植物保护中最广泛使用的制剂之一。随着无人机（UAV）植保的快速发展，SC 从 UAV 应用中出现的喷雾漂移、液滴反弹和润湿性差等问题引起了广泛关注。尽管已经使用了一些桶混助剂来增强 UAV 的施药量，但它们的效果和机制尚不完全清楚，并且很少有制剂是专门为 UAV 设计的。
桶混助剂的类型和浓度影响 SC 的施药量。MO501 可以显著降低 DV，并在浓度≥0.5%时抑制花生叶片上的液滴反弹。Silwet 408 在添加≥0.2%浓度后可以实现完全润湿和超扩展，但只有≥0.5%才能抑制反弹。XL-70 即使在低浓度下也表现出优异的调节能力，0.2%的浓度可以同时抑制冲击和促进扩展。此外，制剂油分散体（OD）在稀释比≤250 倍时可以显著减少可漂移的细颗粒，并抑制反弹，从而提高施药量。
SC 在疏水叶面容易反弹，表现出较差的润湿性和扩展性能。适当类型和浓度的桶混助剂和制剂改进是提高农药施药量的两种有效策略，而添加不适当的助剂可能会带来潜在风险。这些发现为合理选择桶混助剂和 OD 在 UAV 植保中的潜在应用提供了指导。© 2023 英国化学学会。
