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1 October 2010 Susceptibility of Isofamilies of Spodoptera frugiperda (Lepidoptera: Noctuidae) to Cry1Ac and Cry1Fa Proteins of Bacillus thuringiensis
Carlos A. Blanco, Maribel Portilla, Juan Luis Jurat-Fuentes, Jaime F. Sánchez, Diego Viteri, Paulina Vega-Aquino, Antonio P. Terán-Vargas, Ausencio Azuara-Domínguez, Juan D. López Jr., Renée Arias, Yu-Cheng Zhu, David Lugo-Barrera, Ryan Jackson
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Abstract

The fall armyworm, Spodoptera frugiperda (J. E. Smith), is one of the most important insect pests on the American continent. Its control has relied primarily on multiple applications of insecticides that can amount to 1,000 g of active ingredient per hectare on some of approximately 30 crops the insect damages. The use of genetically engineered crops that express Bacillus thuringiensis (Bt) Berliner toxins, Bt-corn, Zee meys L.; and Bt-cotton, Gossypium hirsutum L.; are other ways to control this insect. However, fall armyworm is one of the Lepidoptera species least susceptible to Bt proteins, and a case of high tolerance to Bt-corn has already being reported. We found the susceptibility to Cry1Ac and Cry1Fa proteins of Bt in 133 isofamilies from five regions of three countries was similar to the susceptibility of two Bt-susceptible laboratory colonies to these proteins. Four isofamilies from Puerto Rico were very tolerant to Cry1Fa and not so tolerant to Cry1Ac. Two of the four isofamilies were backcrossed with a Bt-susceptible laboratory colony and their progeny was as susceptible to both Bt proteins as was the Bt-susceptible colony, indicating that resistance to Bt is a recessive trait.

Carlos A. Blanco, Maribel Portilla, Juan Luis Jurat-Fuentes, Jaime F. Sánchez, Diego Viteri, Paulina Vega-Aquino, Antonio P. Terán-Vargas, Ausencio Azuara-Domínguez, Juan D. López Jr., Renée Arias, Yu-Cheng Zhu, David Lugo-Barrera, and Ryan Jackson "Susceptibility of Isofamilies of Spodoptera frugiperda (Lepidoptera: Noctuidae) to Cry1Ac and Cry1Fa Proteins of Bacillus thuringiensis," Southwestern Entomologist 35(3), 409-415, (1 October 2010). https://doi.org/10.3958/059.035.0325
Published: 1 October 2010
JOURNAL ARTICLE
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