Avaliação do potencial inseticida do extrato hidroalcoólico de Annona muricata em larvas de moscas

Abstract

The use of chemicals in pathogenic pests and stressful is recurrent due to its effectiveness. However, studies point out environmental problems that its improper handling can cause mainly pollutions, intoxications and the development of species resistant to the product. The Manejo Integrado de Pragas (MIP) is a program that seeks to avoid excessive use of chemicals, encouraging the use of plants with repellent and insecticidal properties. Annonaceae is a family that has a great toxic potential for pests, however only about 2% of its species have been explored in this regard. Therefore, the present work aimed to evaluate the insecticidal potential of hydroalcoholic extract of Annona muricata in fly larvae in Pedro ll-Piauí. The plant was collected at the Ecoescola Tomas A Kempis and hydroalcoholic extract prepared at IFPI-campus Pedro ll by leaf washing, drying, crushing, 50% ethanol, filtration, water bath, evaporation and application in concentrations of 100%, 50%, 25%, 12.5%, a control group and use of Test t and ABOOT for data analysis. It was found that only treatment 3 presented p> 0.005 for the t test, indicating that it was the only one that did not show significance for repellency in the first 24 hours and accepted H0. As for insecticidal action, the first three days indicated efficiency index B (low) and S (selective) only after 4 days, scale A (High) was obtained. Thus, the present study indicated that the repellent action was more strongly verified, while the satisfactory insecticide occurred only after 4 days without feeding conditions for the larvae. There was no stimulus to pulpation. Thus, since the plant has toxic potential, research is essential to identify the active principles responsible for the repellent and insecticidal response in the larvae, as well as the identification of the species affected in the present work.