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Selection of the Fall Armyworm, Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) for Survival on Cry La(B) Bt Toxin

DOI: http://dx.doi.org/10.18512/1980-6477/rbms.v1n3p12-17

http://rbms.cnpms.embrapa.br/index.php/ojs/index 

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Francys M. F. Vilella1, José M. Waquil2, Evaldo F. Vilela1, Blair D. Siegfried3 & John E. Foster3

 

Abstract: Transgenic maize hybrids expressing Bacillus thuringiensis (Bt) toxin are considered an important technology to control lepidopteran pests of maize. Bt maize hybrids expressing the Cry1A(b) toxin have shown a significant level to fall armyworm (FAW), Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae), resistance, although larvae survival has been observed on these hybrids. In addition, S. frugiperda resistance to different insecticides has been reported. Increased tolerance to Cry1A(b) toxin was found on fall armyworm populations after four generations selection. This result indicates that FAW tolerance to Cry1A(b) toxin had a heritable component.

Key words: Insecta, resistance, transgenic plants.

 

Resumo: Plantas transgênicas que expressam toxinas da bactéria Bacillus thuringiensis (Bt) representam um importante avanço para o controle de lepidópteros-pragas de milho. Híbridos de milho Bt expressando a toxina Cry1A(b) têm mostrado significativo nível de resistência à lagarta-do-cartucho (LCM), Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae), embora larvas dessa espécie tenham sido observadas em campo e em laboratório sobrevivendo nesses híbridos. Resistência de S. frugiperda também tem sido registrada para diferentes inseticidas. Em bioensaios, seleção de insetos sobreviventes mostrou um aumento do nível de tolerância à toxina do Bt Cry1A(b) em populações da lagarta-do-cartucho, após quatro gerações, indicando que essa tolerância é herdada.

Palavras-chave: Insecta, resistência, plantas transgênicas.

 

1 Departamento de Biologia Animal, Universidade Federal de Viçosa. CEP. 36571-000 Viçosa, MG.
2 Pesquisador, Embrapa Milho e Sorgo/Bolsista do CNPq. Caixa Postal 151, CEP. 35701-970 Sete Lagoas, MG. E-mail: waquil@cnpms.embrapa.br (autor para correspondência)
3 Department of Entomology/UN-L, Lincoln, NE, USA.

 

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