Modificações do aparelho reprodutor de Brontocoris tabidus (Heteroptera: Pentatomidae) após exposição à deltametrina

• Ano de defesa: 2007
• Autor(a) principal: Vargas, Paulo Sérgio da Rocha
• Orientador(a): Zanuncio, José Cola
• Banca de defesa: Polanczyk, Ricardo Antônio , Pereira, José Milton Milagres , Duarte, Antonio Nascimento , Pratissoli, Dirceu
• 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: Brontocoris tabidus; Heteroptera; Deltametrina; Aparelho reprodutor; Morfologia; Morfometria; Histologia
• Palavras-chave em Inglês: Brontocoris tabidus; Heteroptera; Deltamethrin; Reproductor system; Morphology; Morphometry; Histology
• Área do conhecimento CNPq: CNPQ::CIENCIAS BIOLOGICAS::ZOOLOGIA::ZOOLOGIA APLICADA
• Link de acesso: http://locus.ufv.br/handle/123456789/4009

Beneficial insects such as Pentatomidae predators can be negatively or positively affected by insecticides. This research studied the impact of the deltamethrin Decis 25CE, with the concentrations of 0,0165%, 0.033% e 0.066%, representing the treatments T1, T2 and T3, respectively, on the reproductive system of males and females of the predator Brontocoris tabidus (Signoret, 1852) (Heteroptera: Pentatomidae). This insecticide was applied on third instar nymphs of this predator at the temperature of 26 ± 2°C, relative humidity of 60 ± 10% and photo phase of 12 hours. Nymphs of B. tabidus, that survived the treatments, were maintained in organza bag on Eucalyptus urophylla plants with Tenebrio molitor L. (Coleoptera: Tenebrionidae) pupae until emergence. The testicles and the ovaries of B. tabidus were extracted, observed its morphology and morphometry analysis included in resin for histological cuttings. The tracheal system, that supplies oxygen to the gonads is, probably, the main intoxication way to expose such structures to volatiles of the deltamethrin. This insecticide had higher impact on males than on females of B. tabidus, with progressive disorganization of the follicles and of the enclosed structures, and it delayed the development of its follicles in relation to the control. The own tunic of the testicles of B. tabidus was the most affected structure with a reduction in the thickness and continuity solution, besides thickening the terminal areas of the gonads. Alterations in the female gonad with the deltamethrin did not show a defined pattern, because the histological profile of individuals of this predator in the T2 was similar to that of the control. The deltamethrin increased morphologically the length and width of the gonad of B. tabidus and histological delayed or impeded cellular differentiation and the presence of maturation areas. Besides, this insecticide altered structures of the testicles and ovarioles as the hem of the follicle and own sheet, in the males, and peritoneal hems and own tunic in B. tabidus females compared to the control.