Department of Entomology and Plant Pathology, NC State University, Mountain Horticultural Crops Research and Extension Center, Mills River, NC.
J Econ Entomol. 2020 Feb 8;113(1):98-107. doi: 10.1093/jee/toz274.
Brown marmorated stink bug, Halyomorpha halys Stål, is an invasive species of Asian origin that is an important agricultural pest in the eastern United States. Sentinel egg masses are tools used to assess the impact of natural enemies on H. halys populations. To determine the effect of host egg age and storage conditions on their susceptibility to parasitism, H. halys eggs were stored at different temperatures for different lengths of time and then exposed to Anastatus reduvii (Howard), a native natural enemy of H. halys occurring in eastern North America. For eggs stored at 15, 20, and 25°C and then exposed to A. reduvii, the number of host eggs from which parasitoid offspring emerged declined with age of eggs. Control eggs (exposed to parasitoids without being stored) and those eggs stored for only 5.5 degree-days (DD) (=0.5 days) at 25°C yielded the highest percentage of parasitoids at 88.2 and 88.3%, respectively. For eggs stored at 20 and 25°C for 7.3 DD to about 36 DD, offspring emerged from about 58 to 73% of eggs, and total parasitism (emerged + unemerged parasitoids) ranged from about 70 to 80%. Parasitoid emergence was significantly lower for host eggs stored at 15°C for comparable times at 20 and 25°C. Stink bugs nymphs hatched from <0.6% of all eggs. Parasitoid-induced host egg abortion was an important component of egg mortality caused by A. reduvii, with underdeveloped stink bug nymphs, undifferentiated cell contents, and parasitoid host feeding occurring across all storage treatments.
褐纹东方蝽，是一种起源于亚洲的入侵物种，是美国东部重要的农业害虫。哨兵卵块是用来评估天敌对 H. halys 种群影响的工具。为了确定宿主卵龄和储存条件对其易感性的影响，将 H. halys 卵在不同温度下储存不同时间，然后暴露于 Anastatus reduvii（Howard），一种发生在北美东部的 H. halys 的本地天敌。对于储存在 15、20 和 25°C 然后暴露于 A. reduvii 的卵，寄生蜂后代从宿主卵中出现的数量随着卵龄的增加而减少。对照卵（暴露于寄生蜂而不储存）和仅在 25°C 下储存 5.5 度-天（DD）（=0.5 天）的卵的寄生率最高，分别为 88.2%和 88.3%。对于储存在 20 和 25°C 下 7.3 DD 至约 36 DD 的卵，后代从约 58%至 73%的卵中出现，总寄生率（出现的+未出现的寄生蜂）约为 70%至 80%。在 20 和 25°C 下储存可比时间的 15°C 宿主卵的寄生率显著降低。从所有卵中孵化出的臭虫若虫不到 0.6%。寄生蜂诱导的宿主卵败育是 A. reduvii 引起的卵死亡率的一个重要组成部分，在所有储存处理中都观察到未发育的臭虫若虫、未分化的细胞内容物和寄生蜂宿主取食。
