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Spinetoram resistance drives interspecific competition between Megalurothrips usitatus and Frankliniella intonsa

文献类型： 外文期刊

作者： Fu, Buli 1 ; Tao, Min 3 ; Xue, Hu 1 ; Jin, Haifeng 4 ; Liu, Kui 2 ; Qiu, Haiyan 2 ; Yang, Shiyou 4 ; Yang, Xin 3 ; Gui, Lianyou 1 ; Zhang, Youjun 1 ; Gao, Yulin 5 ;

作者机构： 1.Yangtze Univ, Coll Agr, Hubei Engn Technol Pest Forewarning & Management, Jingzhou 434025, Peoples R China

2.Chinese Acad Trop Agr Sci, Minist Agr & Rural Affairs, Key Lab Integrated Pest Management Trop Crops, Environm & Plant Protect Inst, Haikou 571101, Hainan, Peoples R China

3.Chinese Acad Agr Sci, Inst Vegetables & Flowers, Dept Plant Protect, Beijing, Peoples R China

4.Hainan Univ, Haikou, Hainan, Peoples R China

5.Chinese Acad Agr Sci, Inst Plant Protect, State Key Lab Biol Plant Dis & Insect Pest, Beijing, Peoples R China

关键词： thrips; insecticide resistance; fitness cost; interspecific competition; sustainable pest control

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.462； 五年影响因子：4.688 ）

ISSN： 1526-498X

年卷期： 2022 年 78 卷 6 期

页码：

收录情况： SCI

摘要： 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 existing fitness costs, but not the M. usitatus. These indicate that a rapid development of spinetoram resistance and the lack of associated fitness costs may be the mechanism underlying recent dominance of M. usitatus over F. intonsa. CONCLUSION Collectively, our results uncover the involvement of insecticide resistance in conferring displacement mechanism behind interspecific competition, providing a framework for understanding the significance of the evolutionary relationships among insects under ongoing changing environments. These findings also can be invaluable in proposing the most appropriate strategies for sustainable thrips control programs.

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