National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology (NPAAC), Guangzhou, China.
College of Electronic Engineering and Artificial Intelligence, South China Agricultural University, Guangzhou, China.
Pest Manag Sci. 2024 Jun;80(6):2647-2657. doi: 10.1002/ps.7981. Epub 2024 Feb 23.
The wettability of target crop surfaces affects pesticide wetting and deposition. The structure and properties of the leaf surface of litchi leaves undergo severe changes after infestation by Aceria litchii (Keifer). The objective of this study was to systematically investigate the surface texture and wettability of litchi leaves infested.
Firstly, the investigation focused on the surface structure and physicochemical properties of litchi leaves infested with Aceria litchii. Subsequently, different levels of Contact Angle (CA) were measured individually on the infested litchi leaves. Lastly, Surface Free Energy (SFE) and its polar and dispersive components were calculated using the Owens-Wendt-Rabel-Kaelble (OWRK) method. The outcomes revealed distinctive 3D surface structures of the erineum at various stages of mycorrhizal growth. At stage NO. 1, the height of the fungus displayed a peaked appearance, with the skewness value indicating a surface characterized by more crests. In contrast, at stages NO. 2 and NO. 3, the surface appeared relatively flat. Furthermore, post-infestation of litchi leaves, the CA of droplets on the abaxial surface of diseased leaves exhibited an increase, while the SFE value on the abaxial surface of leaves decreased significantly, in contrast to the abaxial surface of healthy leaves.
The infestation behavior of Aceria litchii changed the surface structure and chemistry of litchi leaves, which directly affected the CA value of foliar liquids and the SFE value of leaves, changing the surface wettability of litchi leaves from hydrophobic to superhydrophobic. This study provides useful information for improving the wetting and deposition behavior of liquid droplets on the surface of infested leaves. © 2024 Society of Chemical Industry.
靶标作物表面的润湿性会影响农药的润湿和沉积。荔枝叶片在荔枝红蜘蛛（Aceria litchii）侵害后，其叶片表面的结构和性质会发生剧烈变化。本研究旨在系统地研究荔枝叶片受侵害后的表面纹理和润湿性。
首先，我们研究了受荔枝红蜘蛛侵害的荔枝叶片的表面结构和理化性质。随后，我们单独测量了受侵害荔枝叶片上不同水平的接触角（CA）。最后，我们使用 Owens-Wendt-Rabel-Kaelble（OWRK）方法计算了表面自由能（SFE）及其极性和分散分量。结果显示，在不同的共生生长阶段，叶瘿螨 erineum 具有独特的 3D 表面结构。在阶段 1 中，真菌的高度呈峰状，偏度值表明表面有更多的波峰。相比之下，在阶段 2 和阶段 3 中，表面相对平坦。此外，荔枝叶片受侵害后，患病叶片下表面液滴的 CA 值增加，而叶片下表面的 SFE 值显著降低，与健康叶片的下表面相比。
荔枝红蜘蛛的侵害行为改变了荔枝叶片的表面结构和化学成分，这直接影响了叶片上液体的 CA 值和叶片的 SFE 值，使荔枝叶片的表面润湿性从疏水变为超疏水。本研究为改善受侵害叶片表面液滴的润湿和沉积行为提供了有用的信息。 © 2024 化学工业协会。
