Abstract Economically damaging infestations of Lygus lineolaris (Palisot de Beauvois), tarnished plant bug, were sporadic in Virginia and North Carolina cotton before 2010. Given the sudden rise of L. lineolaris as an economic pest in these states, regionally specific management practices (i.e., chemical and cultural control) are needed to help producers protect yield potential while minimizing input costs. Field experiments were conducted in Virginia and North Carolina in 2018 and 2019 to 1) determine the effects of various management practices on L. lineolaris density, plant injury (i.e., square retention, internal boll injury), and lint yield, 2) calculate the economic trade-offs between integrated pest management (IPM) systems approach and current management practices for L. lineolaris in these states, and 3) evaluate economic benefits associated with various sampling thresholds. Lygus lineolaris populations peaked mid-season (i.e., August) during cotton flowering in both states. Weekly scouting and applying foliar insecticides when the current University Extension recommended economic threshold was reached was the most critical management treatment in maximizing economic returns. Additional costs among various IPM practices did not translate into significant yield protection and economic gains. Moreover, there were additional economic benefits associated with protecting glabrous and longer maturing varieties in Virginia. Lygus lineolaris density varied significantly between states; therefore, management recommendations should be modified based on the growing region. Results from this study will be used to create an IPM strategy to help cotton producers effectively manage this insect pest in the Southeast.

中文翻译：

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评估弗吉尼亚州和北卡罗来纳州棉花污染植物病虫害（半翅目：翅科）管理实践的系统方法

摘要 2010 年之前，在弗吉尼亚州和北卡罗来纳州的棉花中，具有经济破坏性的线虫 (Palisot de Beauvois) 侵染在弗吉尼亚州和北卡罗来纳州的棉花中是零星的。鉴于线虫在这些州突然成为经济害虫，区域特定的管理实践（即、化学和文化控制）来帮助生产者保护产量潜力，同时最大限度地降低投入成本。2018 年和 2019 年在弗吉尼亚州和北卡罗来纳州进行了田间试验，以 1) 确定各种管理措施对线虫密度、植株损伤（即方滞留、内铃损伤）和皮棉产量的影响，2) 计算综合虫害管理 (IPM) 系统方法与这些州线虫的当前管理实践之间的经济权衡，3) 评估与各种抽样阈值相关的经济效益。Lygus lineolaris 种群在两个州的棉花开花期在季节中期（即 8 月）达到顶峰。当达到当前大学推广推荐的经济阈值时，每周侦察和施用叶面杀虫剂是最大限度地提高经济回报的最关键的管理方法。各种 IPM 实践中的额外成本并未转化为显着的产量保护和经济收益。此外，保护弗吉尼亚州的无毛和成熟期更长的品种还有额外的经济效益。Lygus lineolaris 密度在各州之间存在显着差异；因此，应根据种植区域修改管理建议。