West Central Research and Extension Center, University of Nebraska-Lincoln, North Platte, Nebraska, USA.
USDA-ARS Aerial Application Technology Research Unit, College Station, Texas, USA.
Pest Manag Sci. 2022 Apr;78(4):1538-1546. doi: 10.1002/ps.6772. Epub 2022 Feb 1.
Early-postemergence herbicide applications in the USA often include residual herbicides such as S-metolachlor to suppress late late-emerging Amaranthus spp. Although this practice benefits weed control, herbicide tankmixes can influence spray droplet size and drift potential during applications. The addition of S-metolachlor products to dicamba spray solutions generally decreases spray droplet size and increases spray drift potential. Advances in formulation technology fostered the development of products with reduced spray drift potential, especially for herbicide premixes containing multiple active ingredients. The objective of this study was to compare the drift potential of a novel dicamba plus S-metolachlor premix formulation (capsule suspension) against a tankmix containing dicamba (soluble liquid) and S-metolachlor (emulsifiable concentrate) using different venturi nozzles.
The MUG nozzle had greater D (1128.6 μm) compared to the ULDM (930.3 μm), TDXL-D (872.9 μm), and TTI nozzles (854.8 μm). The premix formulation had greater D (971.0 μm) compared to the tankmix (922.3 μm). Nozzle influenced spray drift deposition (P < 0.0001) and soybean biomass reduction (P = 0.0465). Herbicide formulation influenced spray drift deposition (P < 0.0001), and biomass reduction of soybean (P < 0.0001) and cotton (P = 0.0479). The novel capsule suspension formulation (premix) of dicamba plus S-metolachlor had reduced area under the drift curve (AUDC) (577.6) compared to the tankmix (913.7). Applications using the MUG nozzle reduced AUDC (459.9) compared to the other venturi nozzles (ranging from 677.4 to 1141.7).
Study results evidence that advances in pesticide formulation can improve pesticide drift mitigation. © 2021 Society of Chemical Industry.
在美国，苗后早期除草剂的应用通常包括残留除草剂，如 S-甲草氯，以抑制后期晚发的苋菜属植物。虽然这种做法有利于杂草控制，但除草剂混合液会影响应用过程中的喷雾液滴大小和漂移潜力。将 S-甲草氯产品添加到麦草畏喷雾溶液中通常会减小喷雾液滴大小并增加喷雾漂移潜力。配方技术的进步促进了具有降低喷雾漂移潜力的产品的发展，特别是对于含有多种活性成分的除草剂预混料。本研究的目的是比较新型麦草畏加 S-甲草氯预混配方（胶囊悬浮液）与含有麦草畏（可溶性液体）和 S-甲草氯（乳油）的罐混液在使用不同文丘里喷嘴时的漂移潜力。
MUG 喷嘴的 D（1128.6μm）大于 ULDM（930.3μm）、TDXL-D（872.9μm）和 TTI 喷嘴（854.8μm）。预混配方的 D（971.0μm）大于罐混液（922.3μm）。喷嘴影响喷雾漂移沉积（P<0.0001）和大豆生物量减少（P=0.0465）。除草剂配方影响喷雾漂移沉积（P<0.0001）和大豆（P<0.0001）和棉花（P=0.0479）的生物量减少。新型麦草畏加 S-甲草氯胶囊悬浮液配方（预混料）的漂移曲线下面积（AUDC）（577.6）小于罐混液（913.7）。与其他文丘里喷嘴（930.3μm 至 1141.7μm）相比，使用 MUG 喷嘴减少了 AUDC（459.9）。
研究结果表明，农药配方的进步可以改善农药漂移缓解。© 2021 化学工业协会。
