Influência de extratos aquosos vegetais sobre o desenvolvimento da lagarta-do-cartucho, Spodoptera frugiperda (J. E. Smith, 1797)

Abstract

It was determined in laboratory conditions, the influence of aqueous extracts of chinaberry (Melia azedarach), pepper cambuci (Capsicum baccatum), alamanda (Cathartica Allamanda), spring flower (Bougainvillea glabra) and neem (Azadirachta indica) in the armyworm biology (Spodoptera frugiperda). This work was developed in the Entomology Laboratory of the Universidade Federal da Fronteira Sul - Laranjeiras do Sul/Paraná, Brazil. Spodoptera frugiperda larvae in different instars were placed in Petri dishes, where maize leaves were offered soaked in aqueous extracts 10%. The experimental design was completely randomized with 7 treatments: chinaberry (50% leave 50% fruit), chinaberry (100% fruit), alamanda (70% leave 30% flower), spring flower (100% leave), pepper cambuci (70% leave 30% fruit) neem (100% leave) and distilled water with evaluation of the 1st, 3rd and 5th instar, 20, 16, 20 the number of repetitions, respectively. The parameters evaluated were: larval development period, pupal weight, pupae viability sex ratio and mortality. The results were submitted to Tukey test at 1% error probability . It was found that the treatments consisting of A. indica and M. azedarach had 100% mortality, while A. cathartica showed no toxic effect on the development and mortality of S. frugiperda.