Avaliação do extrato foliar da erva-de-passarinho (struthantus Marginatus dsr. Blume) como repelente e inseticida contra cupim Nasutiterme sp. (isoptera termitidae)

Abstract

Termites are xylophagous organisms that cause economic impacts for the timber sector. Control is currently carried out whit industrial chemical insecticides that can cause harm to humans and impact the environment. Therefore, there is an urgent need to seek new formulas to combat these organisms, such as, for example, the use of substances extracted from plants. In this sense, we sought to evaluate the potential of leaves of Struthantus marginatus Dsr. Blume, as an insecticide repellent against Nasutitermes termite. The extracts were obtained using the cold technique with aqueous, ethanolic and hydroalcoholic solvents (1:1) at concentrations of 1,5%, 5% and 10%. Testes “Force Feeding” and reelence were made and calculating the Repellent Index (RI), the Food Preference Index (IPA) and the percentage of dead termites in each treatment. Results showed that the ethanolic extract presented the best result for repellency in all tested concentrations. The highest IPA occurred at a concentration of 5% for the aqueous and ethanolic extracts. The aqueous extract was where the highest percentage of dead individuals occurred. It is concludent that the aqueous and ethanolic extracts have repellent potential and the aqueous extract potential for efficient killing of termites of the genus Nasutitermes.