title: Spodoptera frugiperda (J.E. Smith) with field-evolved resistance to Bt maize are susceptible to Bt pesticides.
abstract: Field-evolved resistance to maize event TC1507 expressing the Cry1Fa toxin from Bacillus thuringiensis (Bt) was detected in populations of Spodoptera frugiperda from Puerto Rico. We tested for cross-resistance to purified Cry1A toxins and commercial Bt pesticides in susceptible (Benzon) and TC1507-resistant (456) strains of S. frugiperda. Larvae from the 456 strain exhibited cross-resistance to Cry1Ab and Cry1Ac toxins, while no differences in susceptibility to XenTari WG and DiPel ES pesticides were detected. These data support cross-resistance to toxins that share binding sites with Cry1Fa and no cross-resistance to Bt pesticides in S. frugiperda with field-evolved resistance to Bt maize.
authors.affiliation: Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA.
authors.forename: S R K
authors.initials: SR
authors.lastname: Jakka
authors.affiliation: Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA.
authors.forename: V R
authors.initials: VR
authors.lastname: Knight
authors.affiliation: Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA. Electronic address: jurat@utk.edu.
authors.forename: J L
authors.initials: JL
authors.lastname: Jurat-Fuentes
mesh_terms: D000818:Animals; D001413:Bacillus thuringiensis; D001427:Bacterial Toxins; D007305:Insecticide Resistance / Q000502:physiology*; D010572:Pest Control, Biological / Q000379:methods*; D030821:Plants, Genetically Modified; D018411:Spodoptera / Q000382:microbiology*; D003313:Zea mays / Q000235:genetics* / Q000382:microbiology
chemical_list: D001427:Bacterial Toxins
keywords: Bacillus thuringiensis; Bt maize; Bt pesticide; Bt resistance; Cross-resistance; Spodoptera frugiperda