Efeito subletal de extratos aquosos de Trichilia spp. sobre o desenvolvimento de Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) em Milho

Abstract

Among the new alternatives to pest control according to IPM systems, insecticide plants are an important tool because they reduce the use of synthetic insecticides, so preserving human health and the environment. The activity of aqueous extracts of leaves and twigs from six Trichilia species (T. casaretti, T. catigua, T. clausseni, T. elegans, T. pallens and T. pallida) was evaluated on Spodoptera frugiperda (J.E. Smith) development in laboratory conditions. Maize leaves immerged in each extract 1% (weight/volume) were dried and then provided to the first instar larvae. The effect of the extracts on survival, duration and weight of larval and pupal period was evaluated. The extracts from twigs of T. pallida and leaves of T. pallens were more efficient although the extracts from leaves of T. pallida, T. catigua, T. casaretti and T. elegans and twigs of T. clausseni and T. pallens also have affected the insect development.