Spodoptera frugiperda (fall armyworm) poses a substantial risk to crops worldwide, resulting in considerable economic damage. The gut microbiota of insects plays crucial roles in digestion, nutrition, immunity, growth and, sometimes, the degradation of insecticides. The current study examines the effect of synthetic insecticides on the gut microbiome of third instar S. frugiperda larvae using both culture-dependent techniques and 16S rRNA gene sequencing for bacterial community profiling and diversity analysis. In untreated larvae, the sequencing approach revealed a diverse microbiome dominated by the phyla Firmicutes, Proteobacteria and Bacteroidota, with key genera including Bacteroides, Faecalibacterium and Pelomonas. In parallel, 323 bacterial strains were isolated and assigned to the orders Bacillales, Burkholderiales, Enterobacterales, Flavobacteriales, Lactobacillales, Micrococcales, Neisseriaies, Pseudomonadales, Sphingobacteriales and Xanthomonadales. The prevailing culturable species included Serratia marcescens, Klebsiella variicola and Enterobacter quasiroggenkampii. Treatment with sublethal concentrations of three insecticides (broflanilide, spinosad and indoxacarb) caused significant changes in gut microbiome diversity and composition. Treated larvae showed a shift towards increased Proteobacteria abundance and decreased Firmicutes. Specifically, Acinetobacter and Rhodococcus were dominant in treated samples. Functional predictions highlighted significant metabolic versatility involving nutrient processing, immune response, detoxification, xenobiotic metabolism, and stress response, suggesting microbial adaptation to insecticide exposure. Network correlation analysis highlighted disrupted microbial interactions and altered community structures under insecticide treatment. These findings enhance our understanding of how insecticides impact the gut microbiota in S. frugiperda and may inform future strategies for managing pest resistance through microbiome-based approaches.

College of Agriculture College of Life Sciences Guizhou University Guiyang China

Department of Biology and Ecology Faculty of Science University of Ostrava Ostrava Czech Republic

Department of Biology Vrije Universiteit Brussel Brussels Belgium

Department of Entomology University of Agriculture Faisalabad Pakistan

Department of Plants and Crops Ghent University Ghent Belgium

Guizhou Provincial Science and Technology Department Guizhou Europe Environmental Biotechnology and Agricultural Informatics Oversea Innovation Center in Guizhou University Guiyang China

Institute of Entomology Guizhou University Guiyang China

Key Laboratory of Biodiversity and Environment on the Qinghai Tibetan Plateau Ministry of Education School of Ecology and Environment Tibet University Lhasa China

School of Biological Sciences Faculty of Environmental and Life Sciences University of Southampton Southampton UK

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