Spinetoram resistance drives interspecific competition between Megalurothrips usitatus and Frankliniella intonsa

作者：Buli Fu, Min Tao, Hu Xue, Haifeng Jin, Kui Liu, Haiyan Qiu, Shiyou Yang, Xin Yang, Lianyou Gui, Youjun Zhang, Yulin Gao · 发表于：Pest Management Science · 年份：2022 · DOI：10.1002/ps.6839 · 被引用次数：49 · 研究领域：Insect-Plant Interactions and Control、Agricultural pest management studies、Insect Pheromone Research and Control

Abstract BACKGROUND Species displacement by the outcome of interspecific competition is of particular importance to pest management. Over the past decade, spinetoram has been extensively applied in control of the two closely related thrips Megalurothrips usitatus and Frankliniella intonsa worldwide, while whether its resistance is implicated in mediating interspecific interplay of the two thrips remains elusive to date. RESULTS Field population dynamics (from 2017 to 2019) demonstrated a trend toward displacement of F. intonsa by M. usitatus on cowpea crops, supporting an existing interspecific competition. Following exposure to spinetoram, M. usitatus became the predominate species, which suggests the use of spinetoram appears to be responsible for mediating interspecific interactions of the two thrips. Further annual and seasonal analysis (from 2016 to 2020) of field‐evolved resistance dynamics revealed that M. usitatus developed remarkably higher resistance to spinetoram compared to that of F. intonsa , implying a close relationship between evolution of spinetoram resistance and their competitive interactions. After 12 generations of laboratory selection, resistance to spinetoram in M. usitatus and F. intonsa increased up to 64.50‐fold and 28.33‐fold, and the average realized heritability ( h 2 ) of resistance was calculated as 0.2550 and 0.1602, respectively. Interestingly, two‐sex life table analysis showed that the spinetoram‐resistant strain of F. intonsa exhibited exi...