Spodoptera frugiperda (J.E. Smith) with field-evolved resistance to Bt maize are susceptible to Bt pesticides

S R K Jakka; V R Knight; J L Jurat-Fuentes

doi:10.1016/j.jip.2014.08.009

Spodoptera frugiperda (J.E. Smith) with field-evolved resistance to Bt maize are susceptible to Bt pesticides

J Invertebr Pathol. 2014 Oct:122:52-4. doi: 10.1016/j.jip.2014.08.009. Epub 2014 Sep 8.

Authors

S R K Jakka¹, V R Knight¹, J L Jurat-Fuentes²

Affiliations

¹ Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA.
² Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA. Electronic address: [email protected].

PMID: 25218399
DOI: 10.1016/j.jip.2014.08.009

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.

Keywords: Bacillus thuringiensis; Bt maize; Bt pesticide; Bt resistance; Cross-resistance; Spodoptera frugiperda.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Animals
Bacillus thuringiensis*
Bacterial Toxins
Insecticide Resistance / physiology*
Pest Control, Biological / methods*
Plants, Genetically Modified
Spodoptera / microbiology*
Zea mays / genetics*
Zea mays / microbiology

Substances

Bacterial Toxins