Comparison of demography and biocontrol efficacy of Encarsia sophia reared on Hamiltonella-infected and Hamiltonella-free whitefly strains

文献类型： 外文期刊

第一作者： Li, Jiayin

作者： Li, Jiayin;Guo, Cuiping;Wang, Lukuan;Yang, Xinyuan;Wu, Shibo;Xu, Haiyun;Wu, Qiang;Xu, Haiyun

作者机构：

关键词： Bemisia tabaci; endosymbiont; Aphelinidae; two-sex life table; antibiotics

期刊名称：ENTOMOLOGIA GENERALIS （ 影响因子：4.6； 五年影响因子：4.4 ）

ISSN： 0171-8177

年卷期： 2025 年 45 卷 2 期

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收录情况： SCI

摘要： The sweetpotato whitefly, Bemisia tabaci (Hemiptera: Aleyrodidae), harbors a diverse array of bacterial endosymbionts, including Candidatus Hamiltonella defensa (hereafter Hamiltonella). The nutritional role of Hamiltonella in regulating the biology of B. tabaci has been well documented, and the potential for disrupting or manipulating white-fly endosymbionts for pest control has increased. However, the precise role of Hamiltonella in the interaction between whiteflies and parasitoids remains unclear. Parasitoids are recognized as effective biological control agents of B. tabaci. Understanding the effects of Hamiltonella on parasitoids across whitefly strains harboring different endosymbionts is of practical importance. In this study, antibiotics were employed to selectively eliminate Hamiltonella from B. tabaci Middle East-Asia Minor 1 to examine its effects on the demography and biocontrol efficacy of Encarsia sophia (Hymenoptera: Aphelinidae), a dominant parasitoid of B. tabaci. The results showed that the elimination of Hamiltonella in B. tabaci led to a prolonged immature development period, reduced adult longevity, and decreased survival rate and fecundity of E. sophia. Although no significant difference was observed in the net host-feeding rate (C0) and whitefly-killing rate (Z0) between Hamiltonella-infected and Hamiltonella-free whitefly strains, E. sophia reared on Hamiltonella-infected B. tabaci performed better as a biological control agent compared to those reared on Hamiltonella-free B. tabaci, as assessed by the life table parameters. These results indicate that the elimination of Hamiltonella in whitefly reduces the fitness of the parasitoid. Considering this negative effect on parasitoids, the use of antibiotics to disrupt Hamiltonella symbiont for whitefly control should be approached with caution.

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