Lahiri S, Reisig D D, Reay-Jones F P F, Greene J K, Carter T E, Mian R, Fallen B D
Department of Entomology and Plant Pathology, North Carolina State University, Vernon G. James Research and Extension Center, Plymouth, NC.
Department of Plant and Environmental Sciences, Clemson University, Pee Dee Research and Education Center, Florence, SC.
Environ Entomol. 2020 Feb 17;49(1):88-97. doi: 10.1093/ee/nvz158.
Megacopta cribraria (F.) (Hemiptera: Plataspidae) is an invasive pest of soybean that has spread across the southeastern United States since its initial discovery in 2009 in Georgia. Previous studies in the southeastern states have documented both the population dynamics of this pest and host plant resistance (HPR) among soybean varieties, although the specific mechanisms of HPR remain unknown. The objectives of this study were, therefore, to 1) quantify field resistance to M. cribraria in multiple soybean varieties in two states previously affected by severe M. cribraria infestations, North Carolina (NC) and South Carolina (SC); and 2) study the role of soybean trichome density in imparting resistance against M. cribraria. Soybean variety 'Camp' was least attractive to M. cribraria, through time and locations, suggesting consistent resistance. Other varieties showed variable performance among the locations and sampling dates. A significant difference in trichome density was evident. However, there was no correlation between trichome density and M. cribraria infestation. Compared to a previously published study in the same location, when M. cribraria adults emerging from overwintering dispersed into soybeans, in our study only first-generation adults dispersed into soybeans. Considering the current trend of significantly lower M. cribraria infestation rates in North and South Carolina, this pest may be finally succumbing to indigenous natural enemies and should be managed by incorporating integrated pest management tactics, such as HPR, that help conserve natural enemy populations.
豆龟蝽（Megacopta cribraria (F.)，半翅目：龟蝽科）是大豆的一种入侵性害虫，自2009年在佐治亚州首次发现以来，已蔓延至美国东南部。此前在东南部各州开展的研究记录了这种害虫的种群动态以及大豆品种间的寄主植物抗性（HPR），尽管HPR的具体机制尚不清楚。因此，本研究的目的是：1）量化在之前遭受豆龟蝽严重侵害的两个州——北卡罗来纳州（NC）和南卡罗来纳州（SC）——的多个大豆品种对豆龟蝽的田间抗性；2）研究大豆毛状体密度在赋予抗豆龟蝽能力方面的作用。大豆品种“坎普”在不同时间和地点对豆龟蝽的吸引力最小，表明其具有稳定的抗性。其他品种在不同地点和采样日期表现各异。毛状体密度存在显著差异。然而，毛状体密度与豆龟蝽侵染之间没有相关性。与之前在同一地点发表的研究相比，之前的研究中从越冬状态羽化的豆龟蝽成虫会扩散到大豆田中，而在我们的研究中只有第一代成虫扩散到大豆田中。考虑到北卡罗来纳州和南卡罗来纳州目前豆龟蝽侵染率显著降低的趋势，这种害虫可能最终会被本地天敌所抑制，应采用综合虫害管理策略（如HPR）进行管理，以帮助保护天敌种群。
