Abstract

RIMOLDI, FEDERICO; FOGEL, MARILINA NOELIA; SCHNEIDER, MARCELA INÉS  and  RONCO, ALICIA ESTELA. Indirect effects of conventional and biorational insecticides on feeding of Rachiplusia nu (Lepidoptera: Noctuidae). Rev. Colomb. Entomol. [online]. 2015, vol.41, n.1, pp.48-57. ISSN 0120-0488.

The assessment of sublethal and lethal effects of insecticides on pests allows obtaining further insight of their efficacy. In this way, the pest feeding pattern is a relevant toxicological endpoint to analyze the effectiveness of insecticides on phytophagous insects, due to insecticides that interfere with the normal feeding behavior of a pest contributing to its population management. The objective of the present study was evaluating the effects of endosulfan, cypermethrin, spinosad and methoxyfenozide on feeding pattern of Rachiplusia nu, a potential pest in several crops but mainly in soybean, using laboratory choice test (Centro de Investigaciones del Medio Ambiente (CIMumen: A) La Plata, Argentina). Additionally, the larval survival was also assessed. Cypermethrin and spinosad induced antifeedant effects on exposed larvae. Endosulfan did not cause significant effects, while larvae exposed to methoxyfenozide showed preference towards the treated leaves. Biorational insecticides showed higher mortality to R. nu control than conventional ones. These new insights contribute with knowledge for redefining effective pest control strategies.

Keywords : Consumption patterns; Agricultural pest; Chemical control; Lethal effects; Sublethal effects.

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