Document Detail

Enhanced esterase activity and resistance to azinphosmethyl in target and nontarget organisms.
MedLine Citation:
PMID:  18386945     Owner:  NLM     Status:  MEDLINE    
The organophosphorous compound azinphosmethyl (AzMe) is applied extensively in northern Patagonia (southern Argentina) to manage codling moths (Cydia pomonella). This area is irrigated by fast-flowing channels that provide a favorable habitat for many species, including amphipods (Hyalella curvispina) and a field-mixed population of black flies (Simulium bonaerense, Simulium wolffhuegeli, and Simulium nigristrigatum). In the present study, AzMe susceptibility and carboxylesterase (CarbE) activity from both insecticide-exposed and nonexposed field populations were studied. The median lethal dose determined in codling moths from an insecticide-treated orchard was significantly higher (3.48 microg/insect) than that observed in those from an untreated orchard (0.69 microg/insect). Similarly, the median lethal concentration (LC50) determined in black flies collected from the treated area (0.021 mg/L) was significantly higher than that recorded in those from the untreated site (0.011 mg/L). For amphipods, both a subpopulation susceptible to AzMe (LC50, 1.83 microg/L) and a resistant one (LC50, 390 microg/L) were found in the treated area. Both subpopulations were more resistant to AzMe than the population from the untreated site (LC50, 0.43 microg/L). Significant differences (p < 0.001) in CarbE activities were observed between populations from pesticide-treated and untreated areas. Mean activities +/- standard deviation from treated and untreated sites were 0.21 +/- 0.16 and 0.016 +/- 0.008 micromol/min/mg protein, respectively, for codling moths; 2.17 +/- 1.71 and 0.81 +/- 0.35 micromol/min/mg protein, respectively, for black flies; and 0.27 +/- 0.10 and 0.14 +/- 0.07 micromol/min/mg protein, respectively, for amphipods. The results suggest that enhanced CarbE activity is one of the mechanisms that provide AzMe resistance in H. curvispina, Simulium spp., and C. pomonella populations from the insecticide-treated areas.
Olga L Anguiano; Ana Ferrari; Ii Jimena Soleño; María C Martínez; Andrés Venturino; Ana M Pechen de D'Angelo; Cristina M Montagna
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental toxicology and chemistry / SETAC     Volume:  27     ISSN:  0730-7268     ISO Abbreviation:  Environ. Toxicol. Chem.     Publication Date:  2008 Oct 
Date Detail:
Created Date:  2008-12-24     Completed Date:  2009-02-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8308958     Medline TA:  Environ Toxicol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2117-23     Citation Subset:  IM    
Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, Neuquén 8300, Argentina.
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MeSH Terms
Azinphosmethyl / toxicity*
Carboxylic Ester Hydrolases / metabolism
Cholinesterase Inhibitors / toxicity*
Drug Resistance
Esterases / metabolism*
Insecticides / toxicity*
Invertebrates / physiology*
Lethal Dose 50
Reg. No./Substance:
0/Cholinesterase Inhibitors; 0/Insecticides; 86-50-0/Azinphosmethyl; EC 3.1.-/Esterases; EC 3.1.1.-/Carboxylic Ester Hydrolases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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