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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

High frequency of CYP337B3 gene associated with control failures of Helicoverpa armigera with pyrethroid insecticides in Brazil

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Author(s):
Durigan, Mariana Regina [1] ; Correa, Alberto Soares [1] ; Pereira, Rogerio Machado [1] ; Leite, Natalia Alves [1] ; Amado, Douglas [1] ; de Sousa, Dayana Rosalina [1] ; Omoto, Celso [1]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr ESALQ, Entomol & Acarol Dept, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY; v. 143, p. 73-80, NOV 2017.
Web of Science Citations: 8
Abstract

Control failures with the use of pyrethroid insecticides have been reported frequently for populations of Helicoverpa armigera (Hubner) in Brazil, since its detection in 2013. Here, we confirmed and investigated the metabolic mechanisms of pyrethroid resistance in H. armigera populations from Brazil. Mortality of H. armigera populations was lower than 50% at the highest dose (10 mu g a.i./3rd instar larva) of the pyrethroids deltamethrin and fenvalerate in dose-response bioassays. Very low mortality (10 to 40%) was obtained at a diagnostic dose of 10 mu g a.i./larva for each pyrethroid in H. armigera populations collected from different agricultural regions in Brazil, from 2013 to 2016. In synergist bioassays, when larvae were treated with PBO synergist, the mortality of all populations tested was 100%. The frequency of the cytochrome P450 CYP337B3 gene was above 0.95 in all populations of H. armigera. We found only fourteen heterozygous H. armigera out of 497 individuals tested for this gene subfamily. Our results indicated that H. armigera populations from Brazil have different degrees of susceptibility to deltamethrin and fenvalerate, but all populations can be considered tolerant to pyrethroid insecticides. The chimeric P450 CYP337B3 enzyme is one of the main mechanisms of pyrethroid resistance in Brazilian H. armigera populations. (AU)

FAPESP's process: 14/11495-3 - A demographic and adaptive approach for the development of sustainable management strategies of pest control to the Brazilian agroecosystem
Grantee:Alberto Soares Corrêa
Support Opportunities: Research Grants - Young Investigators Grants