Occurrence and impact of the parasitic mite Linobia coccinellae on its host beetle Chrysomela populi : implications for its potential as a biological control agent,Entomologia Experimentalis et Applicata

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Occurrence and impact of the parasitic mite Linobia coccinellae on its host beetle Chrysomela populi : implications for its potential as a biological control agent
Entomologia Experimentalis et Applicata ( IF 1.4 ) Pub Date : 2020-10-01 , DOI: 10.1111/eea.12979
Klara Pohlink ₁ , Richard Georgi ₁ , Michael Müller ₁

Affiliation

Due to social demands with regard to sustainability and ecological considerations, an aim of current research in short‐rotation coppices (SRC) is to find effective candidates for biological control of pest species. The great red poplar leaf beetle, Chrysomela populi L. (Coleoptera: Chrysomelidae), is one of the most harmful pests in the SRC. The endoparasitic mite Linobia coccinellae (Scopoli) (Acari: Astigmata, Hemisarcoptidae) lives under the elytra of C. populi and feeds on the beetles' hemolymph. The population dynamics of the mites and their impact on the fecundity and longevity of female beetles were examined in two experiments. To study the occurrence of the mites, beetles were collected from two poplar SRC sites in Germany on three dates. Infestation rates of collected male and female C. populi individuals increased over the course of the year and reached 78–97% in the last survey. Females were parasitized more often than males at any time. For the second part of the study, beetles were reared under laboratory conditions to study the development of the mites and their impact on the hosts. For this purpose, half of the females were actively seeded with five adult females of L. coccinellae and the other half was used as a control. There was no significant impact on longevity or reproductive traits of the beetles. Despite the high rates of infestation, it appears that the mites do not have a serious effect on female beetles. Thus L. coccinellae, by itself, is not an effective biological control agent against C. populi. However, it remains to be investigated whether the mites increase the beetles' susceptibility to other biotic and abiotic factors, and so may contribute to an integrated pest management regime with multiple antagonists.

中文翻译：

寄生螨 Linobia coccinellae 对其宿主甲虫 Chrysomela populi 的发生和影响：对其作为生物防治剂潜力的影响

由于社会对可持续性和生态考虑的需求，目前短轮伐林 (SRC) 研究的一个目标是寻找有效的害虫生物防治候选物。大红杨叶甲虫 Chrysomela populi L.（鞘翅目：Chrysomelidae）是 SRC 中最有害的害虫之一。内寄生螨 Linobia coccinellae (Scopoli) (Acari: Astigmata, Hemisarcoptidae) 生活在 C. populi 的鞘翅下，以甲虫的血淋巴为食。在两个实验中检查了螨虫的种群动态及其对雌性甲虫的繁殖力和寿命的影响。为了研究螨虫的发生，在三个日期从德国的两个杨树 SRC 地点收集了甲虫。收集到的雄性和雌性的侵染率 C. 人口数量在这一年中有所增加，在上次调查中达到了 78-97%。在任何时候，雌性比雄性更常被寄生。在研究的第二部分，甲虫在实验室条件下饲养，以研究螨虫的发育及其对宿主的影响。为此，将一半的雌性积极接种五只 L. coccinellae 的成年雌性，另一半用作对照。对甲虫的寿命或繁殖性状没有显着影响。尽管感染率很高，但螨虫似乎对雌性甲虫没有严重影响。因此，L. coccinellae 本身并不是针对 C. populi 的有效生物控制剂。然而，螨虫是否会增加甲虫的数量仍有待研究。

更新日期：2020-10-01

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