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Practical resistance to Cry toxins and efficacy of Vip3Aa in Bt cotton against Helicoverpa zea.
Yang, Fei; Kerns, David L; Little, Nathan; Brown, Sebe A; Stewart, Scott D; Catchot, Angus L; Cook, Donald R; Gore, Jeffrey; Crow, Whitney D; Lorenz, Gustav M; Towles, Tyler; Tabashnik, Bruce E.
Afiliación
  • Yang F; Department of Entomology, Texas A&M University, College Station, TX, USA.
  • Kerns DL; Department of Entomology, Texas A&M University, College Station, TX, USA.
  • Little N; Southern Insect Management Research Unit, USDA-ARS, Stoneville, MS, USA.
  • Brown SA; Department of Entomology and Plant Pathology, University of Tennessee, Jackson, TN, USA.
  • Stewart SD; Department of Entomology and Plant Pathology, University of Tennessee, Jackson, TN, USA.
  • Catchot AL; Department of Biochemistry, Molecular Biology, Entomology, and Plant Pathology, Mississippi State University, Mississippi State, MS, USA.
  • Cook DR; Department of Biochemistry, Molecular Biology, Entomology, and Plant Pathology, Mississippi State University, Mississippi State, MS, USA.
  • Gore J; Department of Biochemistry, Molecular Biology, Entomology, and Plant Pathology, Mississippi State University, Mississippi State, MS, USA.
  • Crow WD; Department of Biochemistry, Molecular Biology, Entomology, and Plant Pathology, Mississippi State University, Mississippi State, MS, USA.
  • Lorenz GM; Department of Entomology and Plant Pathology, University of Arkansas, Lonoke, AR, USA.
  • Towles T; Department of Entomology, Louisiana State University, Winnsboro, LA, USA.
  • Tabashnik BE; Department of Entomology, University of Arizona, Tucson, AZ, USA.
Pest Manag Sci ; 78(12): 5234-5242, 2022 Dec.
Article en En | MEDLINE | ID: mdl-36053801
BACKGROUND: Crops genetically engineered to make insect-killing proteins from Bacillus thuringiensis (Bt) have revolutionized management of some pests. However, the benefits of such transgenic crops are reduced when pests evolve resistance to Bt toxins. We evaluated resistance to Bt toxins and Bt cotton plants using laboratory bioassays and complementary field trials focusing on Helicoverpa zea, one of the most economically important pests of cotton and other crops in the United States. RESULTS: The data from 235 laboratory bioassays demonstrate resistance to Cry1Ac, Cry1Fa, and Cry2Ab occurred in most of the 95 strains of H. zea derived from Arkansas, Louisiana, Mississippi, Tennessee, and Texas during 2016 to 2021. Complementary field data show efficacy decreased for Bt cotton producing Cry1Ac + Cry1Fa or Cry1Ac + Cry2Ab, but not Cry1Ac + Cry1Fa + Vip3Aa. Moreover, analysis of data paired by field site and year shows higher survival in bioassays was generally associated with lower efficacy of Bt cotton. CONCLUSIONS: The results confirm and extend previous evidence showing widespread practical resistance of H. zea in the United States to the Cry toxins produced by Bt cotton and corn, but not to Vip3Aa. Despite deployment in combination with Cry toxins in Bt crops, Vip3Aa effectively acts as a single toxin against H. zea larvae that are highly resistant to Cry toxins. Furthermore, Vip3Aa adoption is increasing and previous work provided an early warning of field-evolved resistance. Thus, rigorous resistance management measures are needed to preserve the efficacy of Vip3Aa against this highly adaptable pest. © 2022 Society of Chemical Industry.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Bacillus thuringiensis / Mariposas Nocturnas Límite: Animals País/Región como asunto: America do norte Idioma: En Revista: Pest Manag Sci Asunto de la revista: TOXICOLOGIA Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Bacillus thuringiensis / Mariposas Nocturnas Límite: Animals País/Región como asunto: America do norte Idioma: En Revista: Pest Manag Sci Asunto de la revista: TOXICOLOGIA Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido