Jin Ye, Luo Luna, Zhang Ruirui, Li Zhiquan, Zhong Yuan, Xu Shaoqing, Liu Min, Song Jianli
College of Science, China Agricultural University, Beijing, China.
Center for Chemicals Application Technology, China Agricultural University, Beijing, China.
Pest Manag Sci. 2025 Apr;81(4):2101-2113. doi: 10.1002/ps.8611. Epub 2024 Dec 26.
Thrips are among the most damaging pests to cowpeas in Hainan, China. Conventional pesticide application methods often fail to achieve satisfactory control due to the small size and concealed habitats of thrips. This study aimed to enhance the efficacy of pesticides by improving their application techniques. The optimal application time of day was identified, and the physicochemical properties of four types of spray adjuvants were tested to evaluate their impact on efficacy. A terrestrially targeted air-assisted sprayer for cowpeas was designed to adjust the wind direction and target at thrips hiding spots. Field trials were conducted in Hainan to assess the efficacy of modified application times, adjuvant addition, and targeted air-assisted spraying.
The results indicate that clear weather and an 8:00 a.m. application time are optimal, with a 22.52% and 30.22% increase in efficacy compared to applications at 10:00 a.m. and 4:00 p.m., respectively. Two adjuvants, Qigong and Beibeijia, were selected and, when used with a knapsack sprayer, increased efficacy by 28.50% and 17.92%, respectively. The terrestrially targeted air-assisted sprayer significantly improved the reduction rate of the thrips population by 27.31% and 21.77% compared to knapsack sprayers and spray guns, respectively.
The use of the cowpea terrestrial air-assisted sprayer with adjuvants at 8:00 a.m., compared to the conventional application method by farmers using electric knapsack sprayers, resulted in at least a 40.03%, 46.08%, and 52.22% increase in efficacy at 1, 2, and 3 days after treatment, respectively. The findings provide a scientific basis for efficient thrips control in cowpeas. © 2024 Society of Chemical Industry.
蓟马是中国海南豇豆最具危害性的害虫之一。由于蓟马体型小且栖息地隐蔽，传统农药施用方法往往无法达到令人满意的防治效果。本研究旨在通过改进农药施用技术提高其药效。确定了一天中的最佳施用时间，并测试了四种喷雾助剂的理化性质，以评估它们对药效的影响。设计了一种针对豇豆的地面靶向风送喷雾器，用于调整风向并瞄准蓟马藏身之处。在海南进行了田间试验，以评估改进后的施用时间、添加助剂和靶向风送喷雾的效果。
结果表明，晴天且上午8:00施用效果最佳，与上午10:00和下午4:00施用相比，药效分别提高了22.52%和30.22%。选择了两种助剂，即奇功和贝贝嘉，与背负式喷雾器一起使用时，药效分别提高了28.50%和17.92%。与背负式喷雾器和喷枪相比，地面靶向风送喷雾器显著提高了蓟马种群的减少率，分别提高了27.31%和21.77%。
与农民使用电动背负式喷雾器的传统施用方法相比，在上午8:00使用带有助剂的豇豆地面风送喷雾器，处理后1、2和3天的药效分别至少提高了40.03%、46.08%和52.22%。这些发现为豇豆蓟马的高效防治提供了科学依据。© 2024化学工业协会。
