Potencial Inseticida de Extrativos de Três Espécies Vegetais da Amazônia em Cryptotermes brevis Walker, 1853 (1soptera:Kalotemitidae)

Abstract

Cryptotermes brevis have been identified in severa1 studies as a major pest species of termites in urban centers, found mainly in the domestic environment. Control studies of tt-iese insects, an alternative to harmful chemicals known to include the use of plant extracts that can be used as wood preservatives susceptible, and the knowledge of their active substances useful for the production of synthetic insecticides. This work aimed to study the toxicity and antifeedant extractives from the bark of Dalbergia inundata, Senna silvestris and Virola guianensis in Cryptotermes brevis. The extracts were obtained in cold ethanol 95% and mixture of acetone-hexane-water (54:44:2), concentrated in vacuum rotaevapoctor and after diluted to obtain concentrations of 0.1, 1, 2 and 5% and irnpregnated filter paper discs. In each paper disc has ten pseudo-workers of Cryptotermes brevis ten replicates for each concentration. The experiment was followed for thirty days. The extractives were not toxic to termites, but they had influence on consumption. The analysis of the main chemical compounds present in extracts of the species indicated the presence of flavonoids, tannins, anthraquinones, heterosides cyanogenic, steroids, triterpenes and saponins.