Chysodeixis includens and Helicoverpa armigera can negatively impact soybean yield due to defoliation and direct injury on the pods, respectively. Insecticides, such as indoxacarb, are still an important controlling tool to manage these insects. To support Integrated Pest Management (IPM) and Insect Resistance Management (IRM) as well as to reduce product decantation during storage and nozzle clogging in field application, a new indoxacarb formulation (emulsifiable concentrate - EC) was developed to replace the suspension concentrate formulation (SC). The objective of this study was to evaluate the susceptibility and compare the residual effects of two indoxacarb formulations on C. includens and H. armigera on soybean. A dose-response curve and the residual effect from in-field application were obtained using a laboratory strain of both insect pests. Soybean leaflets were collected and dipped into aqueous indoxacarb solutions. The evaluations were performed 96 h after the infestation to calculate the insect mortality percentage and foliar damage. Also, plants were sprayed in the field and leaflets from mid and upper regions of the plants were collected and used to feed third-instar larvae of both species. Results demonstrated that C. includens and H. armigera are similary sensitive to indoxacarb . The residual activity was up to 1 h after application for H. armigera and up to 3 days for C. includens . No difference was observed on this activity between mid and upper regions of the plant. Overall, the enhanced EC formulation is as effective as the SC formulation for the control of both species on soybean.

中文翻译：

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茚虫威制剂对主要大豆鳞翅目害虫的易感性和残留效应

Chysodeixis includens 和棉铃虫可以分别由于落叶和对豆荚的直接伤害而对大豆产量产生负面影响。杀虫剂，如茚虫威，仍然是管理这些昆虫的重要控制工具。为了支持综合害虫管理 (IPM) 和昆虫抗性管理 (IRM) 以及减少储存过程中的产品倾析和现场应用中的喷嘴堵塞，开发了一种新的茚虫威配方（乳油 - EC）来替代悬浮剂配方（ SC)。本研究的目的是评估易感性并比较两种茚虫威制剂对大豆的 C. includens 和棉铃虫的残留影响。使用两种害虫的实验室菌株获得了田间施用的剂量反应曲线和残留效应。收集大豆传单并浸入茚虫威水溶液中。评估在侵染后 96 小时进行，以计算昆虫死亡率和叶面损伤。此外，在田间喷洒植物，收集植物中部和上部区域的小叶，用于喂养这两种物种的三龄幼虫。结果表明，C. includens 和H. armigera 对茚虫威的敏感性相似。棉铃虫的残留活性在施用后长达 1 小时，而棉铃虫的残留活性长达 3 天。在植物的中部和上部区域之间没有观察到这种活性的差异。全面的，