RESUMEN
Species of the genus Alpinia are widely used by the population and have many described biological activities, including activity against insects. In this paper, we describe the bioactivity of the essential oil of two species of Alpinia genus, A. zerumbet and A. vittata, against Rhodnius nasutus, a vector of Chagas disease. The essential oils of these two species were obtained by hydrodistillation and analyzed by GC-MS. The main constituent of A. zerumbet essential oil (OLALPZER) was terpinen-4-ol, which represented 19.7% of the total components identified. In the essential oil of A. vittata (OLALPVIT) the monoterpene ß-pinene (35.3%) was the main constituent. The essential oils and their main constituents were topically applied on R. nasutus fifth-instar nymphs. In the first 10 min of application, OLALPVIT and OLALPZER at 125 µg/mL provoked 73.3% and 83.3% of mortality, respectively. Terpinen-4-ol at 25 µg/mL and ß-pinene at 44 µg/mL provoked 100% of mortality. The monitoring of resistant insects showed that both essential oils exhibited antifeedant activity. These results suggest the potential use of A. zerumbet and A. vittata essential oils and their major constituents to control R. nasutus population.
Asunto(s)
Alpinia/química , Insectos Vectores/efectos de los fármacos , Insecticidas/farmacología , Aceites Volátiles/farmacología , Extractos Vegetales/farmacología , Rhodnius/efectos de los fármacos , Animales , Enfermedad de Chagas/parasitología , Enfermedad de Chagas/transmisión , Vectores de Enfermedades , Cromatografía de Gases y Espectrometría de Masas , Humanos , Insectos Vectores/parasitología , Insecticidas/química , Aceites Volátiles/química , Pruebas de Sensibilidad Parasitaria , Rhodnius/parasitologíaRESUMEN
Bioactivity of the latex from Parahancornia amapa (Apocynaceae) on the development of Rhodnius nasutus (Hemiptera, Reduviidae, Triatominae) under laboratory conditions. The aim of this study was to verify the effects of the methanolic fraction of the latex from Parahancornia amapa (Apocynaceae) (PALAM) on individuals of the species Rhodnius nasutus Stål (Hemiptera, Triatominae). Many of the insects treated with the substance presented deformities and these may interfere in the feeding and possibly hinder the reproductive capacity. They also presented significant mortality during the molt when compared to the control group, noting a gradual increase in mortality. The treated insects also presented delayed nymphal development (5th instar) and higher adult longevity.