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

• Published in: Journal of invertebrate pathology Vol. 122; pp. 52 - 54
• Main Authors: Jakka, S.R.K., Knight, V.R., Jurat-Fuentes, J.L.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.10.2014
• Subjects: Animals; Bacillus thuringiensis; Bacterial Toxins; Bt maize; Bt pesticide; Bt resistance; Cross-resistance; Insecticide Resistance - physiology; Pest Control, Biological - methods; Plants, Genetically Modified; Spodoptera - microbiology; Spodoptera frugiperda; Zea mays - genetics; Zea mays - microbiology; Spodoptera frugiperda; Bt resistance; Bt maize; Bt pesticide; Bacillus thuringiensis; Cross-resistance
• ISSN: 0022-2011; 1096-0805
• DOI: 10.1016/j.jip.2014.08.009

[Display omitted] •Spodoptera frugiperda resistant to Cry1Fa corn are cross-resistant to Cry1A toxins.•Bt corn-resistant S. frugiperda are not cross-resistant to Bt pesticides.•Bt pesticides need be considered in Bt corn-resistant S. frugiperda management. 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.