PROBIEN   20416
INSTITUTO DE INVESTIGACION Y DESARROLLO EN INGENIERIA DE PROCESOS, BIOTECNOLOGIA Y ENERGIAS ALTERNATIVAS
Unidad Ejecutora - UE
artículos
Título:
Toxicological and biochemical response to azinphos-methyl in Cydia pomonella L. (Lepidoptera: Tortricidae) among orchards from the Argentinian Patagonia
Autor/es:
SOLEÑO J., ANGUIANO L., PECHEN DE D' ANGELO A.M., CICHÓN L., FERNÁNDEZ D. AND MONTAGNA C.
Revista:
PEST MANAGEMENT SCIENCE
Editorial:
Wiley
Referencias:
Año: 2008 vol. 64 p. 964 - 970
ISSN:
1526-498X
Resumen:
BACKGROUND: Azinphos-methyl is the main insecticide used to control Cydia pomonella L. from apples and pears in the Northern Patagonia. The aim of this study was to evaluate both the azinphos-methyl toxicity and detoxifying enzyme activity in diapausing larvae of codling moth among different orchards. RESULTS: Significant differences in response to azinphos-methyl were determined between diapausing larvae collected from an untreated orchard (field-reference population) and those from a laboratory-susceptible population. Azinphos-methyl toxicity in field populations collected during 2003-2005 was evaluated by topical application of a discriminating dose determined from the field-reference population. Three out of eight field populations showed significantly lower mortalities (37.71 to 84.21%) than that in the field-reference population. Most of the field populations showed higher esterase activity than the ones determined in both the laboratory-susceptible and the field-reference populations. Moreover, there was a high association between esterase activity and mortality (R2 = 0.64) among the field populations. A poor correlation between glutahione S-tranferase activity and mortality (R2 = 0.33) among larvae collected from different orchards was observed. CONCLUSIONS: All the field populations evaluated exhibited some degree of azinphos-methyl tolerance in relation to the laboratory-susceptible population. Biochemical studies demonstrated that esterases were one of the principal mechanisms involved.