Biocidal radiuses of cycloxaprid, imidacloprid and lambda-cyhalothrin droplets controlling against cotton aphid (Aphis gossypii) using an unmanned aerial vehicle

文献类型： 外文期刊

第一作者： Nahiyoon, Shahzad Ali

作者： Nahiyoon, Shahzad Ali;Cui, Li;Yang, Daibin;Yan, Xiaojing;Rui, Changhui;Yuan, Huizhu

作者机构：

关键词： biocidal radius; droplet size; deposit density; Aphis gossypii; UAV; adjuvant

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.845； 五年影响因子：4.674 ）

ISSN： 1526-498X

年卷期： 2020 年 76 卷 9 期

页码：

收录情况： SCI

摘要： BACKGROUND Unmanned aerial vehicles (UAVs) are a recently advanced aerial spraying technology. However, the median lethal number of droplets (LN50) and biocidal radiuses (r(50)) of insecticides droplets sprayed by UAVs are still unknown. Therefore, we evaluated the LN50 and r(50) of cycloxaprid, imidacloprid and lambda-cyhalothrin droplets associated with adjuvant controlling against Aphis gossypii. RESULTS A small UAV and Potter spray tower (PST) were used to generate different size of droplets (Dv0.5 = 185 +/- 5 and 43 +/- 2 mu m). The mortality of A. gossypii showed a droplet density-dependent process. At the concentration of 5 g L-1, the LN50 of lambda-cyhalothrin, imidacloprid and cycloxaprid droplets sprayed by the UAV were only 49.2, 34.6 and 19.7 droplets cm(-2), respectively, and the r(50) were 0.57, 0.68 and 0.90 mm, respectively. The LN50 values were negatively correlated with insecticide concentrations, but the r(50) values increased with the increasing concentrations. Although cycloxaprid is less toxic to A. gossypii than lambda-cyhalothrin, cycloxaprid had a larger r(50) than lambda-cyhalothrin due to its translocation ability. Furthermore, cycloxaprid had a relatively larger r(50) than imidacloprid because it is more toxic to A. gossypii. Moreover, adjuvant silwet DRS-60 can significantly increase the r(50) of droplets. CONCLUSION Our results revealed that the r(50) of a droplet was higher than its droplet size at tested concentrations. Smaller droplets generated by the PST had relatively higher insecticidal potential. The median lethal dose (LD50) and translocation ability of insecticides and spray adjuvant contributed to their r(50). Therefore, ultra-low-volume spray with UAVs is feasible to control cotton aphids.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序