The parasitoid Aenasius arizonensis prefers its natural host but can parasitize a nonnatural host in the laboratory: an opportunity for control of a new invasive mealybug

文献类型： 外文期刊

第一作者： Huang, Jun

作者： Huang, Jun;Zhi, Fuying;Li, Xiaowei;Lu, Yaobin;Zhi, Fuying;Zhang, Juan

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关键词： Aenasius arizonensis; Phenacoccus solenopsis; Phenacoccus solani; Host preference; Offspring fitness

期刊名称：JOURNAL OF PEST SCIENCE （ 影响因子：5.918； 五年影响因子：5.955 ）

ISSN： 1612-4758

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收录情况： SCI

摘要： 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. Key message 1)Aenasius arizonensis is a specific parasitoid of PSS, but after 6 h, it also parasitized PSI female adults. 2) PSI appeared to be a poor-quality host; however, A. arizonensis still parasitized PSI even after exposure to PSS, resulting in reduced offspring fitness. 3) The chemical volatiles emitted by PSS and PSI were different and may be an important factor for host choice.

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