Rilaković Andrea, da Silva Santana Alisson, Zarić Miloš, Manthena Vamsi, Golus Jeffrey A, Kruger Greg R, Vélez Ana M, Peterson Julie A
University of Nebraska-Lincoln, West Central Research, Extension & Education Center, North Platte, NE, USA.
Department of Statistics, University of Nebraska-Lincoln, Lincoln, NE, USA.
J Econ Entomol. 2025 Apr 26;118(2):672-679. doi: 10.1093/jee/toae306.
The efficacy of aerial application and chemigation of insecticides is not well explored for western bean cutworm, Striacosta albicosta (Smith), management in corn. In the short term, inadequate application of insecticides can lead to control failures when insect pests are not effectively targeted. In the longer term, exposure to sublethal insecticide concentrations can contribute to the evolution of insecticide resistance. The goal of this study was to compare aerial application and chemigation under simulated conditions to determine the most effective insecticide application method for managing S. albicosta. Three larval stages were exposed to the highest and lowest label rates of commercial formulations of bifenthrin (36.8 and 112.1 g a.i. ha-1) and chlorantraniliprole (52.7 and 75.1 g a.i. ha-1). Experiments were conducted in spray chambers, utilizing a carrier volume of 18.7 L ha-1 for aerial application and 1.57 cm ha-1 for chemigation. Mortality was recorded at 16, 24, and 41 h after infestation. The simulated aerial application was more effective than simulated chemigation in controlling S. albicosta, resulting in 100% mortality 24 h after infestation. Within the chemigation applications, chlorantraniliprole treatments were effective at both rates for all instars, while the high rate of bifenthrin exhibited greater efficacy than the lower rate. In conclusion, it was evidenced that the same insecticide active ingredients do not yield equivalent efficacy when applied via aerial application compared to chemigation. The present study highlights the importance of selecting appropriate insecticide application methods in controlling S. albicosta larvae.
在玉米田中防治西部玉米螟（Striacosta albicosta (Smith)）时，飞机喷洒和化学灌溉杀虫剂的效果尚未得到充分研究。短期内，杀虫剂施用不当会导致害虫未被有效防治，从而造成防治失败。从长期来看，接触亚致死浓度的杀虫剂会促使害虫产生抗药性。本研究的目的是在模拟条件下比较飞机喷洒和化学灌溉，以确定防治西部玉米螟最有效的杀虫剂施用方法。三个幼虫阶段接触了联苯菊酯（36.8和112.1克有效成分/公顷）和氯虫苯甲酰胺（52.7和75.1克有效成分/公顷）商业制剂的最高和最低标签剂量。实验在喷雾室内进行，飞机喷洒的载体量为18.7升/公顷，化学灌溉的载体量为1.57厘米/公顷。在侵染后16、24和41小时记录死亡率。模拟飞机喷洒在防治西部玉米螟方面比模拟化学灌溉更有效，侵染后24小时死亡率达100%。在化学灌溉施用中，氯虫苯甲酰胺处理对所有龄期的两种剂量都有效，而联苯菊酯的高剂量比低剂量表现出更高的效果。总之，有证据表明，与化学灌溉相比，相同的杀虫剂活性成分通过飞机喷洒施用时不会产生同等的效果。本研究强调了选择合适的杀虫剂施用方法对防治西部玉米螟幼虫的重要性。
