Abstract The tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), is an important pest of cotton in many areas of the southern United States. An experiment was conducted at two locations in Mississippi during 2016 and 2017 to evaluate action thresholds for tarnished plant bug on a novel Bacillus thuringiensis cotton that expresses the Cry51Aa2.834_16 toxin. Treatments included the current action threshold, a 2× threshold, and treatments where insecticides were only applied during the early season (preflower) or only during late season (during flowering) based on the current action thresholds. These were compared to an untreated control and a weekly insecticide use regime that received weekly insecticide sprays. All treatments were imposed on both Bt Cry1Aa2.834_16 cotton and a nontraited cotton. The Bt Cry1Aa2.834_16 trait reduced the number of tarnished plant bugs and injury, and improved yields compared to nontraited cotton. For all spray treatments except the weekly insecticide use regime, yields were greater for the Bt Cry51Aa2.834_16 cotton than the nontraited cotton. In terms of thresholds, Bt Cry1Aa2.834_16 cotton sprayed based on current action thresholds resulted in similar yields to the weekly insecticide use regime of both cotton types. In contrast, the 2× threshold resulted in lower yields than the current threshold for both cotton types. Though thresholds intermediate to the currently recommended action threshold and the 2× threshold were not tested, these data suggest that currently recommended action thresholds appear appropriate for Bt Cry51Aa2.834_16 cotton. These results suggest that this trait will be an important component of current IPM programs in cotton where tarnished plant bug is an important pest.

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对表达 Bt Cry51Aa2.834_16 性状的转基因 MON 88702 棉花中当前失去光泽的植物病虫（半翅目：鹳科）阈值的评估

摘要 失去光泽的植物臭虫 Lygus lineolaris (Palisot de Beauvois) 是美国南部许多地区的重要棉花害虫。2016 年和 2017 年，在密西西比州的两个地点进行了一项实验，以评估在表达 Cry51Aa2.834_16 毒素的新型苏云金芽孢杆菌棉花上失去光泽的植物病虫的行动阈值。处理包括当前作用阈值、2x 阈值，以及基于当前作用阈值仅在早季（花前）或仅在晚季（开花期间）施用杀虫剂的处理。将这些与未经处理的对照和每周接受杀虫剂喷雾的每周杀虫剂使用方案进行比较。所有处理均施加于 Bt Cry1Aa2.834_16 棉花和非性状棉花。Bt Cry1Aa2。与非性状棉花相比，834_16 性状减少了失去光泽的植物病虫害和损伤的数量，并提高了产量。对于除每周杀虫剂使用方案以外的所有喷雾处理，Bt Cry51Aa2.834_16 棉花的产量高于非性状棉花。在阈值方面，根据当前的行动阈值喷洒的 Bt Cry1Aa2.834_16 棉花导致的产量与两种棉花类型的每周杀虫剂使用制度相似。相比之下，2x 阈值导致两种棉花类型的产量低于当前阈值。尽管当前推荐的操作阈值和 2x 阈值中间的阈值没有测试，但这些数据表明当前推荐的操作阈值似乎适用于 Bt Cry51Aa2.834_16 棉花。