Thelytokous strains have better biocontrol potential than arrhenotokous strains: the parasitoid Neochrysocharis formosa on the invasive tomato leafminer Tuta absoluta as a case study
Hao Wang, Yu-Juan Gu, Rong-Rong Song, Chi Zhang, Wan-Xue Liu, Fang-Hao Wan, Nicolas Desneux, Gui-Fen Zhang, Yi-Bo Zhang
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Abstract
Tuta absoluta, a destructive tomato pest worldwide, has recently invaded China. Neochrysocharis formosa, a host-feeding parasitoid wasp, has thelytokous (TH) and arrhenotokous (AR) strains with sympatric distributions in many regions of China. To clarify the biocontrol potential of the two strains, we evaluated the host-killing behaviors on different instar larvae of T. absoluta and the life history traits of the two strains reared on T. absoluta. Our results showed that both strains can parasitize, feed and directly kill 1st to 3rd instar T. absoluta larvae. In contrast, in 4th instar larvae, both strains only kill larvae by host-stinging. When the 1st instar host was constantly provided, the TH strain showed significantly greater biocontrol potential than the AR strain. The former had higher fecundity (2.10-fold), killed more larval hosts (1.57-fold), survived longer (1.37-fold), and had more offspring (2.07-fold) that successfully emerged. In summary, the TH strain of N. formosa is a better candidate for biological control than the AR strain of T. absoluta. These results will play a pivotal role in building a biological control technology system for the notorious pest T. absoluta.
Thelytokous 菌株比 arrhenotokous 菌株具有更好的生物控制潜力：以寄生类 Neochrysocharis formosa 对入侵的番茄潜叶蝇 Tuta absoluta 的寄生为案例研究
Tuta absoluta是一种世界性毁灭性番茄害虫，最近已入侵中国。以寄主为食的寄生蜂Neochrysocharis formosa在中国许多地区都有同域分布。为了明确这两株寄生蜂的生物防治潜力，我们评估了这两株寄生蜂对绝对蓟马不同龄幼虫的寄主杀伤行为以及在绝对蓟马上饲养的生活史特征。结果表明，两种菌株都能寄生、取食并直接杀死第一至第三龄的绝对拟尾柱虫幼虫。相反，在第四龄幼虫身上，两种菌株都只能通过寄主刺杀幼虫。在不断提供第一龄寄主的情况下，TH 菌株的生物控制潜力明显高于 AR 菌株。前者的繁殖力更高（2.10 倍），杀死的幼虫宿主更多（1.57 倍），存活时间更长（1.37 倍），成功萌发的后代更多（2.07 倍）。总之，与 T. absoluta 的 AR 菌株相比，N. formosa 的 TH 菌株更适合用于生物防治。这些结果将对建立针对臭名昭著的害虫 T. absoluta 的生物防治技术体系起到关键作用。
期刊介绍：
Its scope covers all aspects of basic and applied research dealing with insects and more broadly with arthropods inhabiting wild, agricultural and/or urban habitats. The journal also considers research integrating various disciplines and issues within the broad field of entomology and ecology.
Entomologia Generalis publishes high quality research articles on advances in knowledge on the ecology and biology of arthropods, as well as on their importance for key ecosystems services, e.g. as biological control and pollination. The journal devotes special attention to contributions providing significant advances (i) on the fundamental knowledge and on sustainable control strategies of arthropod pests (including of stored products) and vectors of diseases, (ii) on the biology and ecology of beneficial arthropods, (iii) on the spread and impact of invasive pests, and (iv) on potential side effects of pest management methods.
Entomologia Generalis welcomes review articles on significant developments in the field of entomology. These are usually invited by the editorial board, but proposals may be sent to the Editor-in-Chief for preliminary assessment by the editorial board before formal submission to the journal. The journal also considers comments on papers published in Entomologia Generalis, as well as short notes on topics that are of broader interest.
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