Controle do caruncho Callosobruchus maculatus (Fabr., 1775) (Coleóptera: Bruchidae) utilizando extratos de Piper nigrum L. (Piperaceae) pelo método de vapor

Abstract

Considering the damage caused by the insect pest Callosobruchus maculatus (Fabr., 1775) to stored Vigna unguiculata Walp beans, this work aimed to evaluate the effectiveness of extracts of Piper nigrum L. in the control of adults of the referred species. The statistical outline used was made at random with four repetitions and factorial arrangement 3 x 5, formed by three concentrations of the extract and five periods of exposure to the extracts (5, 10, 15, 20 and 25 minutes). P. nigrum grounded dry fruits were used for extraction , which was done with ethyl alcohol (70, 50 and 30%), using a percolator. The extracts were applied as steam, using an adapted compressor into a container having 100 insects. By the results it was possible to conclude that the mortality of the insects becomes higher as the period of exposure to the extracts is increased, and that all the concentrations were shown to be effective, although, in terms of absolute values, the extract with 70% of ethyl alcohol was the most effective one.