Seletividade e resposta comportamental do predador Doru luteipes a inseticidas

• Ano de defesa: 2009
• Autor(a) principal: Campos, Mateus Ribeiro de
• Orientador(a): Guedes, Raul Narciso Carvalho
• Banca de defesa: Lúcia, Terezinha Maria Castro Della , Araújo, Márcio da Silva , Fadini, Marcos Antonio Matiello
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Entomologia
• Departamento: Ciência entomológica; Tecnologia entomológica
• País: BR
• Palavras-chave em Português: Spodoptera frugiperda; Seletividade fisiológica; Forficulidae; Repelência; Preferência
• Palavras-chave em Inglês: Spodoptera frugiperda; Physiological selectivity; Forficulidae; Repellency; Preference
• Área do conhecimento CNPq: CNPQ::CIENCIAS BIOLOGICAS::PARASITOLOGIA::ENTOMOLOGIA E MALACOLOGIA DE PARASITOS E VETORES
• Link de acesso: http://locus.ufv.br/handle/123456789/3893

Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) is a major pest of corn in Brazil. Its control is mainly performed by insecticides. Due to the high cost of insecticides and its polluter effect on the environment, the use of biological control might be more a management tool with the chemical control. Among the natural enemies, the earwigs, D. luteipes (Scudder) (Dermaptera: Forficulidae), has been presented as potential biological control agent of S. frugiperda. As a biological agent little is known about selectivity of chemical insecticides used in corn. Thus, this study evaluated the selectivity of insecticides to D. luteipes and the effect on their behavior when exposed to insecticides methomyl, chlorfenapyr, etofenprox, chlorpyrifos, deltamethrin, λ- cyhalothrin, spinosad and chlorantraniliprole. S. frugiperda and D. luteipes were submitted to the bioassays of concentration-mortality to determine the LC50 and LT50, respectively. Adults of D. luteipes underwent two bioassays with surface arena fully treated and arena partially treated with insecticide, to observe the effects of pesticides on their behavior. In the results of the concentrationmortality bioassays showed that the insecticide spinosad was more toxic to S. frugiperda. In the bioassays with adults of D. luteipes showed that the chlorantraniliprole was less toxic and more selective for adults of D. luteipes, and the insecticide chlorpyrifos showed higher toxicity and lower selectivity. In the mortality time bioassays for S. frugiperda with insecticides etofenprox, chlorpyrifos, λ-cyhalothrin and methomyl, these insecticides had higher value for times-lethal. Bioassay of time mortality for adults of D. luteipes observed that the insecticides chlorpyrifos and λ-cyhalothrin showed less lethal time. In behavioral bioassays in arena fully treated for the adults of D. luteipes, they showed a reduction in walking distance and average speed in the treatments, when exposed to the insecticide spinosad. The methomyl and chlorantraniliprole insecticides hadn't effect on the behavior of the predator movement. In the behavioral bioassays in arena partially treated showed that deltamethrin, spinosad and λ-cyhalothrin had effect of attractiveness to adults of D. luteipes. Already chlorpyrifos, chlorfenapyr and etofenprox showed effect repellency to adults of D. luteipes. Thus, one can conclude that assessments of the effects of insecticides on the behavior of natural enemies are important tool to obtain information about the selectivity and toxicity of these insecticides. Thus, the insecticide chlorantraniliprole was highly selective for D. luteipes. Moreover, no effect of irritability or preference in behavioral bioassays was observed. Thus, this insecticide could be used on the integrated management program for control of S. frugiperda in corn.