The absence of natural enemies in newly invaded areas is a key factor in the successful invasion of alien species. Whether a specific parasitoid can be domesticated to attack a nonnatural host that has no reported parasitic enemies in invasive areas remains unclear. Here, we analyzed two invasive mealybugs (PSS-Phenacoccus solenopsis and PSI-Phenacoccus solani) and a specific parasitoid of P. solenopsis (Aenasius arizonensis) to verify this hypothesis under laboratory conditions. A. arizonensis preferred to parasitize PSS, but after 6 h, it also parasitized PSI female adults. The number of visits and parasitism rate was significantly higher for PSS than for PSI. However, the contact time was influenced by the natal host. The chemical volatiles emitted by the two hosts were different and may be an important factor for host choice. Offspring fitness, measured as emergence time, longevity, and hind tibia length, in those emerging from PSS was better in those emerging from PSI, but the emergence rate was higher in the latter. We supposed that A. arizonensis accepts and parasitizes low-quality hosts not because of an "incomplete" evaluation but because it may be more profitable to parasitize than not given circumstances; this may provide an opportunity for the control of a new invasive mealybug in the future.

新入侵地区没有天敌是外来物种成功入侵的关键因素。是否可以驯化特定的寄生蜂来攻击在入侵地区没有报告寄生敌人的非自然宿主，目前尚不清楚。在这里，我们分析了两种侵入性粉蚧（PSS-Phenacoccus solenopsis和PSI- Phenacoccus solani）和一种特定的P. solenopsis ( Aenasius arizonensis )寄生蜂，以在实验室条件下验证这一假设。亚利桑那A.首选寄生 PSS，但 6 小时后，它也寄生 PSI 雌性成虫。PSS 的访问次数和寄生率显着高于 PSI。然而，接触时间受出生宿主的影响。两种宿主释放的化学挥发物不同，可能是宿主选择的重要因素。从PSS出现的后代中，以出现时间、寿命和后胫骨长度衡量的后代健康状况优于PSI出现的后代，但后者出现率更高。我们假设A. arizonensis接受和寄生低质量的宿主不是因为“不完整”的评估，而是因为寄生可能比没有给定的情况更有利可图；这可能为未来控制一种新的侵入性粉蚧提供机会。