Chitin synthesis inhibitors are successfully used in pest control and are an excellent option for use in integrated pest management programs due to their low non-target effects.Reports on field-evolved resistance of lepidopteran pests to chitin synthesis inhibitors and the selection of laboratory resistant strains to these products require a detailed investigation on the resistance mechanisms and on the identification of molecular markers to support the implementation of efficient monitoring and resistance management programs. Teflubenzuron is a chitin synthesis inhibitor highly effective in controlling lepidopteran pests, including nowadays the world widely distributed fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith, 1797) (Lepidoptera: Noctuidae). We report the selection of a laboratory strain of S. frugiperda resistant to teflubenzuron, and its use for the characterization of the inheritance of resistance, evaluation of cross-resistance to other chitin-synthesis inhibitors and the identification of a set of single nucleotide polymorphisms (SNPs) for use as candidate molecular markers for monitoring the evolution of resistance of S. frugiperda to teflubenzuron. The resistance of the selected strain of S. frugiperda to teflubenzuron was characterized as polygenic, autosomal, and incompletely recessive. The resistance ratio observed was nearly 1,365-fold.Teflubenzuron-resistant strain showed some cross-resistance to lufenuron and novaluron but not to chlorfluazuron. We also detected a set of 72 SNPs that could support monitoring of the resistance frequency to teflubenzuron in field populations. Our data contribute to the understanding of the resistance mechanisms and the inheritance of polygenic resistance of S. frugiperda to benzoylureas. We also contribute with candidate markers as tools for monitoring the emergence and spread of teflubenzuron resistance in S. frugiperda.
Caracterização da resistência a teflubenzuron em raças deSpodoptera frugiperda (J.E. Smith, 1797) (Lepidoptera: Noctuidae) Juliana Gonzales Rodrigues Dissertação apresentada para obtenção do título de Mestra em Ciências. Área de concentração: Entomologia Piracicaba 2021 Juliana Gonzales Rodrigues Bióloga Caracterização da resistência a teflubenzuron em raças de Spodoptera frugiperda (J.E. Smith, 1797) (Lepidoptera: Noctuidae) versão revisada de acordo com a resolução CoPGr 6018 de 2011 Orientador: Prof. Dr. CELSO OMOTO Dissertação apresentada para obtenção do título de Mestra em Ciências. Área de concentração: Entomologia
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