Insecticidal Effects Of Croton Urucurana Extracts And Crude Resin On Dysdercus Maurus (hemiptera: Pyrrocoridae)

Yield loss in different crops due to the attack of various classes of insect pests is a worldwide problem. Sucking type Dysdercus maurus causes damage to many crop species. Diverse plant species have been studied in order to identify the active ingredients responsible for their insecticidal activity against pests of economic importance. To verify the insecticidal activity of the stem bark and crude resin of Croton urucurana Baillon 1864 (Euphorbiaceae) against Dysdercus maurus Distant 1901 (Hemiptera: Pyrrhocoridae), the methanolic (EMeOH) extract, dichloromethane fraction (FDM), ethyl acetate fraction (FAE) and crude resin were applied topically with micro- applicator on the dorsal side of the mesothoracic region of third instar nymphs and the ventral side of adult insects and incorporated into an artificial diet. The average adult mortality of Dysdercus maurus treated topically with 0.5, 1.0 and 2.0% of the extracts mentioned above was significantly higher compared to controls. The FAE showed high insecticidal potential, having a higher mortality rate, extending the duration of the larval stages and resulting in malformed adults. Third instar nymphs fed with artificial seeds containing 1% FAE died three days after the start of the experiment, even before the molt to the next instar. For all treatments the death rate was greater for immature forms. These findings may provide a useful beginning for the development of biopesticides. Further studies will be carried out on mating, fecundity and proteolytic activity. © 2012 Academic Journals Inc.9298106Akhtar, Y., Isman, M.B., Comparative growth inhibitory and antifeedant effects of plant extracts and pure allelochemicals on four phytophagous insect species (2004) J. 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Atividade alelopática dos lixiviados de Asemeia extraaxillaris (Polygalaceae) sobre o crescimento de Ipomoea cordifolia

RESUMO O objetivo desse trabalho foi avaliar a atividade alelopática dos lixiviados das raízes e folhas secas de Asemeia extraaxillaris sobre o crescimento de corda de viola Ipomoea cordifolia em casa de vegetação, para avaliação dos efeitos sobre o estresse oxidativo. Nos bioensaios foram utilizadas três concentrações (0,25 - 5,00 e 10,00 g) e um controle, com quatro repetições de 10 plantas, cultivadas em solo durante 30 dias. Os lixiviados possuem ação alelopática e o maior efeito foi verificado para o pó das raizes. O efeito inibitório foi dose-dependente e o aumento do estresse oxidativo foi observado pelos níveis da catalase, peroxidase, superóxido dismutase, glutationa redutase, peroxidação lipídica e síntese de formazan. Concluiu-se que A. extraaxillaris possui substâncias capazes de afetar a emergência, o crescimento e o estresse oxidativo de I. cordifolia