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Genetic architecture and insecticide resistance in Chinese populations of Spodoptera frugiperda

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Abstract

The fall armyworm (FAW), Spodoptera frugiperda invaded China in December 2018 and has since spread quickly countrywide. Two sympatric biotype strains of FAW, rice-strain and corn-strain, have been classified and showed to have different susceptibilities to chemical insecticides. Present FAW control has primarily relied on insecticides, which resulted in a rapid evolution of the resistance to insecticides in FAW. Herein, sixteen geographical populations of FAW were collected annually from maize fields in China between 2019 and 2021, both Tpi genotyping (n = 3079) and feeding preference bioassay (n = 2892) showed Chinese FAW were predominantly the corn-strain. Resistance monitoring revealed that FAW had not evolved resistance to chlorantraniliprole since it invaded China with RRs of 0.32–2.32 and a very low mutation frequency RyR of 0.14%. Most FAW populations were susceptible to emamectin benzoate, spinetoram, indoxacarb, lambda-cyhalothrin and acephate. However, low resistance levels (5 < RR < 10) were detected in some populations, suggesting rotational or mixed applications of insecticides and further resistance monitoring must be strengthened to prevent or delay the development of insecticide resistance. The mutation frequency of ace-1 at the locus A201S and F290V was 21.27% and 84.51%, respectively. The mutation frequency of VGSC at the locus T929I and L1014F was 0.11% and 0.15%, respectively. The detoxification enzyme activities of P450s, ESTs and GSTs were relatively consistent among different populations. Our study provides a systematical understanding of the current genetic architecture and resistance status of FAW in China and will contribute to the region-wide chemical control and the development of resistance management strategies for FAW in China.

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The data presented in this study are available in Supplementary Materials.

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Acknowledgements

The authors are grateful to Ms. Xi Li and Ge Sun for rearing the insects.

Funding

This work was supported by National Key R&D Program of China (Grant No. 2021YFD1400700).

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SHG, HHW and RZ conceived the idea and wrote the manuscript. JG, LZ and SZ contributed to the data analysis. SHG, PL and XWG made critical editing and proofreading of the manuscript. HHW and RZ provided reagents and analytical tools. HHW and RZ performed the bioassays. All the authors read, corrected and approved the manuscript.

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Correspondence to Shao-Hua Gu.

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Communicated by Gaelle Le Goff.

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Wang, HH., Zhao, R., Gao, J. et al. Genetic architecture and insecticide resistance in Chinese populations of Spodoptera frugiperda. J Pest Sci 96, 1595–1610 (2023). https://doi.org/10.1007/s10340-022-01569-2

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