Acetone and ethanol extracts of the tubercula and several compounds isolated from Aristolochia pubescens (Willd) were bioassayed on velvetbean caterpillars, Anticarsia gemmatalis (Hübner), for evaluation of the insecticidal activities. Of the extracts subjected to bioassay, the acetone extract showed the highest activity. (-)-Cubebin did not show activity against soybean caterpillars, whereas aristolochic acid and ent-kaur-15-en-17-ol increased the larval period. These compounds, and (+)-eudesmin and (+)-sesamin, reduced the viability of this period, giving rise to malformed adults. These extracts and compounds are therefore potential botanical insecticide agents for the control of velvetbean caterpillars in soybean crops.
According to the LD(50) and LD(90) for compounds 1 and 2, it can be inferred that the values reflect an acute lethal response to both compounds, based on interaction(s) of the toxicants with a primary target or series of targets. Thus, the amides were demonstrated to have potential value in the control of the sugarcane borer.
Este artigo tem como objetivo refletir como tem se dado o discurso de grupos historicamente excluídos dos processos de desenvolvimento e que atualmente passam por conflitos socioambientais devido ao uso e acesso aos bens naturais em alguns países latinoamericanos. Destaque para o caso dos pescadores artesanais do município de Matinhos, Paraná, comunidade que vem passando nos últimos anos por inúmeros conflitos de ordem ambiental, dentre eles um conflito ligado à implantação de uma Unidade de Conservação de Proteção Integral, que vem impedindo o uso e acesso consuetudinário dos recursos pesqueiros da região.
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