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9 February 2021 Concentration–Mortality Response of Mexican Populations Fall Armyworm (Lepidoptera: Noctuidae) to Commercial Formulations of Bacillus Thuringiensis
María Del Carmen Lara-Becerra, Manuel Alejandro Tejeda-Reyes, Ángel Lagunes-Tejeda, Gonzalo Silva-Aguayo, J. Concepción Rodríguez-Maciel
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Abstract

The fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), is the most economically important pest of maize (Zea mays L.) grown in Mexico. In order to identify biologically based management tactics for this pest, we determined the concentration–mortality response of 16 S. frugiperda populations collected in Mexico to two commercial formulations of Bacillus thuringiensis Berliner (Bt) (XenTari® [Bt subsp. aizawai] and DiPel® [Bt subsp. kurstaki]; Valent de México SA De CV, Jalisco, México). Laboratory bioassays established median lethal concentrations (LC50s) for each Bt formulation × population combination. We also determined mean larval weight 7 d after exposure and the number of larvae that reached the third instar of development. The populations were susceptible to both Bt formulations but they were, overall, more susceptible to Bt subsp. aizawai (XenTari) than to Bt subsp. kurstaki (DiPel). These results can serve as a reference to detect changes in S. frugiperda response to these Bt commercial products over time.

María Del Carmen Lara-Becerra, Manuel Alejandro Tejeda-Reyes, Ángel Lagunes-Tejeda, Gonzalo Silva-Aguayo, and J. Concepción Rodríguez-Maciel "Concentration–Mortality Response of Mexican Populations Fall Armyworm (Lepidoptera: Noctuidae) to Commercial Formulations of Bacillus Thuringiensis," Journal of Entomological Science 56(1), 70-83, (9 February 2021). https://doi.org/10.18474/0749-8004-56.1.70
Received: 17 March 2020; Accepted: 3 May 2020; Published: 9 February 2021
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KEYWORDS
bioassay
bioinsecticides
corn
fall armyworm
resistance
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