Extração do óleo fixo do Syagrus cearensis Noblick e atividade inseticida sobre o Callosobruchus maculatus em feijão armazenado

Abstract

The Cowpea bean, Vigna unguiculata, has an extraordinary role in feeding the population of the North and Northeast regions of the country. However, this crop is still harmed by the significant loss of production due to insect pest attack and poor product quality due to the use of synthetic chemical pesticides. In the present work the effect of the oil of the catolé Syagrus cearensis Noblick as natural defensive was studied on the carouscho Callosobruchus maculatus in cowpea, both purchased in the city of São José do Belmonte, sertão of Pernambuco. The methodology can be reproduced in domestic environment since the oil of catolé is used in cooking and folk medicine and there are no reports of intoxication. For the bio-insecticidal tests only plastic containers, syringes and household scales, all of low cost and commercially available, were used. The concentration of 0.0 mg to 123.2 mg of the oil per 20g of beans were analyzed and as a result the Lethal Concentration (LC50) = 64.96 was estimated using the "trend line" option of the Excel 2010 program, Office, Microsoft. The good results presented here, where there was 100% mortality of C. maculatus with the dosages of (88.0 mg and 123.2 mg), revealing that the catolé oil is an economically viable bioinseticide and accessible for the handling of the caruncho on stored cowpea beans.