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These insects have developed resistance to all the chemical families: organophosphates, carbamates, pyrethroids but also for a more recent family such as diamides. littoralis (Boisduval) have developed resistance. Table 1 shows the available data on the molecules for which these three species, as well as S. They have developed resistance to all chemical families and three of the four Spodoptera species present in the Arthropod Pesticide Resistance Database are in the top 15 most resistant arthropods on the planet: S. The control of these pests requires the massive use of insecticides. With its flight capabilities and under favorable climatic conditions, its invasion of Europe in the near future seems inevitable. Native to the American continent, it was detected in Africa in 2016 and has since invaded Asia and Australia (CABI, Wallingford, UK, 2021). They are present on all continents and their potential invasiveness has been highlighted in recent years, notably with the species S. The genus Spodoptera (Lepidotera: Noctuidae) contains some of the most important insect crop pests, many of which are highly polyphagous species, able to feed on more than 100 host plants including maize, rice, cotton (e.g., Spodoptera litura (Fabricius) ). This review is not intended to be exhaustive but to highlight the key roles of certain genes. Molecular mechanisms underlying the involvement of these genes in resistance will be described, including the duplication of the CYP9A cluster, over-expression of GST epsilon or point mutations in acetylcholinesterase and ABCC2. We compare available data for four species, Spodoptera exigua, S. In this review, we illustrate some examples of the role of major families of detoxification enzymes such as cytochromes P450, carboxyl/cholinesterases, glutathione S-transferases (GST) and transporters such as ATP-binding cassette (ABC) transporters in insecticide resistance. One of the main mechanisms developed by insects to become resistant involves detoxification enzymes. In addition to their ability to adapt to toxic compounds produced by plants, they have developed resistance to the chemical insecticides used for their control. These polyphagous species are able to feed on many plants, including corn, rice and cotton. The genus Spodoptera (Lepidoptera: Noctuidae) includes species that are among the most important crop pests in the world.