Artículos de revistas
Esterase activity in homogenates of Helicoverpa armigera (HUBNER) (Lepidoptera: Noctuidae) exposed to different insecticides and the behavioral effect
Atividade esterase em homogenatos de helicoverpa armigera (HUBNER) (Lepidoptera: Noctuidae) expostos a diferentes inseticidas e o efeito comportamental
Fecha
2019-01-01Registro en:
Bioscience Journal, v. 35, n. 1, p. 166-176, 2019.
1981-3163
1516-3725
10.14393/BJ-v35n1a2019-41477
2-s2.0-85063393312
Autor
Universidade Federal do Piauí
Universidade Federal de Pernambuco (UFPE)
Universidade Estadual Paulista (Unesp)
Institución
Resumen
The toxicity of some insecticides to Helicoverpa armigera was studied through sublethal effects, evaluating the enzymatic activity of esterase and the behavioral response. The commercial formulation of insecticides selected were chlorpyrifos, spinosad, indoxacarb, chlorantraniliprole, lambda-cyhalothrin and Bacillus thuringiensis, corresponding the most used by farmers to control of H. armigera. To determine the esterase activity, the larvae were fed with soybean leaf discs dipped in insecticide solution using the lethal concentration (LC 50 ). For the behavioral response, filter paper were immersed in three concentrations of insecticides (LC 50 , LC 95 and recommend dose.), then the behavior of the larvae observed in Videomex-One. The results for the enzymatic activity showed an increase in the activity of the esterase, with variation along the treatments and the time of exposure of the insects to the insecticides. With exception of spinosad, other insecticides showed an increase in EST-α activity, 6 and 24 hours after contact of caterpillars with insecticide.Different behavioral patterns of walking (walking distance, walking speed and resting time) were observed for H. armigera exposed to different insecticides. H. armigera exposed to chlorpyrifos, lambdacyhalothrin and B. thuringiensis insecticides show greater esterase activity. Regarding walking behavior, the results confirms enzymatic activity, where H. armigera have behavioral alteration after exposure to insecticide.