Biocontrol agents such as parasitic wasps use long-range volatiles and host-associated cues from lower trophic levels to find their hosts. However, this chemical landscape may be altered by the invasion of exotic insect species. The spotted-wing drosophila (SWD), Drosophila suzukii (Diptera: Drosophilidae), is a highly polyphagous fruit pest native to eastern Asia and recently arrived in South America. Our study aimed to characterize the effect of SWD attack on the volatile organic compounds (VOCs) of blueberries, a common host fruit, and to correlate these odor changes with the olfactory-mediated behavioral response of resident populations of Trichopria anastrephae parasitoids, here reported for the first time in Uruguay. Using fruit VOC chemical characterization followed by multivariate analyses of the odor blends of blueberries attacked by SWD, we showed that the development of SWD immature stages inside the fruit generates a different odor profile to that from control fruits (physically damaged and free of damage). These differences can be explained by the diversity, frequency, and amounts of fruit VOCs. The behavioral response of T. anastrephae in Y-tube bioassays showed that female wasps were significantly attracted to volatiles from SWD-attacked blueberries when tested against both clean air and undamaged blueberries. Therefore, T. anastrephae females can use chemical cues from SWD-infested fruits, which may lead to a successful location of their insect host. Since resident parasitoids are able to locate this novel potential host, biological control programs using local populations may be plausible as a strategy for control of SWD.

寄生蜂等生物防治剂使用长程挥发物和来自较低营养水平的宿主相关线索来寻找宿主。然而，外来昆虫物种的入侵可能会改变这种化学景观。斑点翅果蝇（SWD），铃木果蝇（双翅目：果蝇科），是一种原产于东亚的高度多食性水果害虫，最近抵达南美洲。我们的研究旨在表征 SWD 攻击对蓝莓（一种常见的寄主水果）的挥发性有机化合物 (VOC) 的影响，并将这些气味变化与Trichopria anastrephae常驻种群的嗅觉介导的行为反应相关联寄生蜂，这是乌拉圭首次报道。使用水果 VOC 化学表征，然后对受到 SWD 攻击的蓝莓气味混合物进行多变量分析，我们表明水果内部 SWD 未成熟阶段的发展产生了与对照水果不同的气味特征（物理损坏和无损坏）。这些差异可以通过水果 VOC 的多样性、频率和数量来解释。T. anastrephae在 Y 管生物测定中的行为反应表明，在针对清洁空气和未受损蓝莓进行测试时，雌性黄蜂被来自 SWD 攻击的蓝莓的挥发物显着吸引。因此，T. anastrephae雌性可以使用来自 SWD 感染果实的化学线索，这可能会导致其昆虫宿主的成功定位。由于常驻寄生蜂能够定位这种新的潜在宿主，因此使用当地种群的生物控制程序可能是控制 SWD 的一种策略。