Evaluation of azinphos-methyl resistance and activity of detoxifying enzymes in codling moth (Lepidoptera: Tortricidae) from central Chile

Eduardo Fuentes-Contreras, Maritza Regina Reyes-Carreno, Wilson Barros and Benoit Sauphanor
Additional contact information
Eduardo Fuentes-Contreras: Universidad de Talca
Maritza Regina Reyes-Carreno: PSH - Unité de recherche Plantes et Systèmes de Culture Horticoles - INRA - Institut National de la Recherche Agronomique
Wilson Barros: Universidad de Talca
Benoit Sauphanor: PSH - Unité de recherche Plantes et Systèmes de Culture Horticoles - INRA - Institut National de la Recherche Agronomique

Post-Print from HAL

Abstract: Regular applications of insecticides have been the main management practice against codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae) in Chile. Organophosphates are the most widely used insecticides, and azinphos-methyl is an important element in spray programs. In particular, we evaluated diagnostic doses of azinphos-methyl on neonate and postdiapausing larvae from seven apple (Malus spp.) orchards. We also evaluated the activity of detoxifying enzymes, such as glutathione S-transferases (GSTs), cytochrome P450 polysubstrate monooxygenases (PSMOs), and esterases, which are likely to be involved in resistance to insecticides. Such responses were compared with an insecticide-susceptible strain that has been maintained in the laboratory for several years. Neonate larval mortality of field populations to azinphos-methyl was not significantly different from of the susceptible strain. In contrast, postdiapause larval mortality was significantly lower in the six analyzed populations than in the susceptible strain. The C. pomonella populations with reduced postdiapause mortality to azinphos-methyl also showed statistically higher GST activity. Finally, no significant differences were found in total esterase or PSMO activity between C. pomonella populations. Therefore, the observed reduction in postdiapause larval mortality to azinphos-methyl seems to be associated with an increase in GST activity.

Keywords: CYDIA POMONELLA; AZINPHOS-METHYL; RESISTANCE; GLUTATHIONE S-TRANSFERASES; INSECTICIDE (search for similar items in EconPapers)
Date: 2007
References: Add references at CitEc
Citations: View citations in EconPapers (1)

Published in Journal of Economic Entomology, 2007, 100 (2), pp.551-556. ⟨10.1603/0022-0493(2007)100[551:EOARAA]2.0.CO;2⟩

There are no downloads for this item, see the EconPapers FAQ for hints about obtaining it.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:hal:journl:hal-02667510

DOI: 10.1603/0022-0493(2007)100[551:EOARAA]2.0.CO;2

Access Statistics for this paper

More papers in Post-Print from HAL
Bibliographic data for series maintained by CCSD ().