Tidewater Agricultural Research and Extension Center, Virginia Tech University, Suffolk, VA.
Vernon James Research and Extension Center, North Carolina State University, Plymouth, NC.
J Econ Entomol. 2020 Oct 16;113(5):2223-2234. doi: 10.1093/jee/toaa142.
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.
2010 年以前，维吉尼亚州和北卡罗来纳州的棉花上，蜡蚧（Lygus lineolaris）的虫害还零星发生，造成的经济损失较小。鉴于这种昆虫突然成为这两个州的经济害虫，需要采取针对该地区的具体管理措施（即化学和文化控制），以帮助种植者保护产量潜力，同时将投入成本降至最低。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蜡蚧密度、植株损伤（即方格保留、内部棉铃损伤）和皮棉产量的影响，2）计算这些州综合虫害管理（IPM）系统方法与当前蜡蚧管理措施之间的经济权衡，以及 3）评估与各种采样阈值相关的经济收益。在这两个州，蜡蚧的种群在棉花开花期间的 7 月中旬达到高峰。每周巡查，并在当前大学推广建议的经济阈值达到时施叶面杀虫剂，是最大限度提高经济回报的最关键管理措施。各种 IPM 措施之间的额外成本并没有转化为显著的产量保护和经济效益。此外，在弗吉尼亚州保护无绒毛和成熟时间较长的品种还有额外的经济效益。蜡蚧的密度在各州之间差异显著；因此，管理建议应根据种植地区进行修改。本研究的结果将用于制定 IPM 策略，以帮助棉花种植者在东南部有效管理这种虫害。
