Mississippi State University, Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State, MS, USA.
Mississippi State University, Delta Research and Extension Center, Stoneville, MS, USA.
J Econ Entomol. 2022 Aug 10;115(4):1164-1169. doi: 10.1093/jee/toac062.
One of the most economically important pests of cotton, Gossypium hirsutum L., in the midsouth region of the United States is the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois, Hemiptera: Miridae). Tarnished plant bug populations across the region have exhibited widespread resistance to numerous insecticide classes. To minimize late season resistance development, reducing unwarranted applications during the late flowering period can aid in resistance management and potentially reduce input costs. Trials were conducted during 2019 and 2020 to evaluate the impacts of tarnished plant bug populations in the later flowering period of cotton by modifying or terminating threshold regimes during the later weeks of bloom. Results showed that dynamic thresholds altered at the fourth week of bloom or later can reduce the number of late season applications made with no penalty to yield. Additionally, when utilizing a week of bloom termination approach, no significant yield losses were seen when terminating applications after the fourth week of bloom. These data may offer an alternative method to managing tarnished plant bug populations during the later flowering period of midsouth cotton.
在美国中南部地区，棉花最重要的经济害虫之一是棉叶蝉，Lygus lineolaris（Palisot de Beauvois，半翅目：Miridae）。该地区的棉叶蝉种群对许多杀虫剂类别表现出广泛的抗性。为了最大限度地减少后期抗性的发展，减少开花后期不必要的施药可以帮助进行抗性管理并可能降低投入成本。在 2019 年和 2020 年进行了试验，通过在开花后期修改或终止阈值制度来评估棉花后期开花期棉叶蝉种群的影响。结果表明，在第四周或更晚的开花期改变动态阈值可以减少后期施药次数，而不会对产量造成不利影响。此外，当使用一周的开花终止方法时，在第四周的开花期后终止施药不会导致显著的产量损失。这些数据可能为管理美国中南部棉花后期开花期棉叶蝉种群提供了一种替代方法。
