Damage to the growing ears by Spodoptera frugiperda is a major economic burden, therefore, the development of a novel targeted treatment with safe, environmentally friendly, and effective is necessary to control the damage of S. frugiperda in maize ears. In this study, chitosan/sodium alginate hydrogel rings loaded with chlorantraniliprole (CLAP) were prepared by physical embedding and ionic cross-linking method. The CLAP-loaded hydrogel rings were evaluated for their morphology, loading efficiency, encapsulation efficiency, and release kinetics at different pH levels. The efficacy of the CLAP-loaded hydrogel rings and CLAP suspension were evaluated under field conditions for control of S. frugiperda in maize ears, and the distribution and dissipation of CLAP on maize ears were investigated. The results of the two-year trial showed that the insecticidal effects of the CLAP-loaded hydrogel rings treatment were significantly improved contrasted with the use of CLAP suspension, and increased the transfer efficiency of the pesticide from maize bracts to maize kernels. The terminal residues showed that it is safe to use CLAP suspension and CLAP-loaded hydrogel rings on maize ears. This study provides guidance for the use of pesticides to control pests in maize ears in rainfall-rich areas.

Spodoptera frugiperda对生长中的穗的损害是主要的经济负担，因此，开发一种安全，环保，有效的新型靶向治疗方法对于控制S. frugiperda对玉米穗的损害是必要的。在这项研究中，通过物理包埋和离子交联的方法制备了载有氯吡虫啉（CLAP）的壳聚糖/海藻酸钠水凝胶环。评估了CLAP负载的水凝胶环的形态，负载效率，包封效率以及在不同pH值下的释放动力学。拍手加载水凝胶环和CLAP悬浮液的功效进行了田间条件下评价的控制草地夜蛾在玉米穗中，研究了CLAP在玉米穗上的分布和耗散。这项为期两年的试验结果表明，与使用CLAP悬浮液相比，负载CLAP的水凝胶环处理的杀虫效果显着提高，并且提高了农药从玉米片到玉米粒的转移效率。终端残留物表明在玉米穗上使用CLAP悬浮液和装有CLAP的水凝胶环是安全的。该研究为在降雨多的地区使用农药控制玉米穗中的有害生物提供了指导。