Brown stink bugs, Euschistus servus, are an important early-season pest of field corn in the southeastern United States. Feeding in the early stages of corn development can lead to a number of growth deformities and deficiencies and, ultimately, a reduction in yield. An observational and two experimentally manipulated trials were conducted in 2017 and 2018 to 1) determine optimal timing for assessing brown stink bug damage, 2) assess the level of damage from which yield compensation can occur, and 3) examine the relationship between brown stink bug density and early-season damage and yield. Fields were identified with infestations of brown stink bugs and a damage rating system for early stages of corn was established. Varying rates of brown stink bug densities were introduced using field cages and damage was assessed throughout the season. The density and duration of stink bug infestations were critical factors for damage potential, with each day of active feeding per plant resulting in a loss of ~14 kg/ha in yield. The level of damage in early stages of corn was categorized into easily identifiable groups, with only the most severe damage leading to a reduction in yield. Moderate and minimal feeding damage did not result in yield loss. This study emphasizes the need for early and frequent scouting of corn to determine the risk of damage and yield loss from brown stink bugs. Results from this study can be used to help develop management programs for brown stink bugs in the early vegetative stages of field corn.

中文翻译：

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褐蝽（半翅目：蝽科）对玉米幼苗的危害及对粮食产量的影响

褐蝽（Euschistus servus）是美国东南部一种重要的早季玉米害虫。在玉米发育的早期阶段饲喂会导致许多生长畸形和缺陷，并最终导致产量下降。2017 年和 2018 年进行了一项观察性试验和两项实验操作试验，以 1) 确定评估褐蝽损害的最佳时机，2) 评估可能发生产量补偿的损害程度，以及 3) 检查褐蝽之间的关系密度和早季损害和产量。确定了有褐蝽侵扰的田地，并建立了玉米早期阶段的损害评级系统。使用田间笼子引入了不同比率的褐蝽密度，并在整个季节评估了损害。蝽侵扰的密度和持续时间是潜在损害的关键因素，每株植物每天主动喂食导致产量损失约 14 公斤/公顷。玉米早期的损害程度被分类为易于识别的组，只有最严重的损害会导致产量下降。中等和最小的饲喂损害不会导致产量损失。这项研究强调需要对玉米进行早期和频繁的侦察，以确定褐蝽造成的损害和产量损失的风险。这项研究的结果可用于帮助制定玉米早期营养阶段褐蝽的管理计划。玉米早期的损害程度被分类为易于识别的组，只有最严重的损害会导致产量下降。中等和最小的饲喂损害不会导致产量损失。这项研究强调需要对玉米进行早期和频繁的侦察，以确定褐蝽造成的损害和产量损失的风险。这项研究的结果可用于帮助制定玉米早期营养阶段褐蝽的管理计划。玉米早期的损害程度被分类为易于识别的组，只有最严重的损害会导致产量下降。中等和最小的饲喂损害不会导致产量损失。这项研究强调需要对玉米进行早期和频繁的侦察，以确定褐蝽造成的损害和产量损失的风险。这项研究的结果可用于帮助制定玉米早期营养阶段褐蝽的管理计划。这项研究强调需要对玉米进行早期和频繁的侦察，以确定褐蝽造成的损害和产量损失的风险。这项研究的结果可用于帮助制定玉米早期营养阶段褐蝽的管理计划。这项研究强调需要对玉米进行早期和频繁的侦察，以确定褐蝽造成的损害和产量损失的风险。这项研究的结果可用于帮助制定玉米早期营养阶段褐蝽的管理计划。