Utilização de inseticidas botânicos no controle de rhynchophorus palmarum L. (coleoptera: curculionidae)

Abstract

With the ever-increasing demand for agricultural practices aimed at preserving the environment, alternatives that provide a reduction in rampant use of non-biodegradable products, become indispensable. Therefore, the objective through this work to verify the efficiency of botanical insecticides as Rhynchophorus palmarum controllers. The botanical insecticides tested were the Extrato Pirolenhoso®, Óleo de Neem Puro®, Pironim® and Rotenona®. Bioassays were conducted in the laboratory under a temperature of 25 ± 1° C, 12 hours stage photo and relative humidity of 60 ± 10%. Repellency test arenas were used with PVC pipes containing stalks of sugar cane treated with insecticides at concentrations of 0.50, 1, 1.5 and 2% and witness offered to insects with choice. Mortality test insects were packed in plastic containers with volume of 250 ml, 5 mL solution was applied in concentrations 1, 5 and 10% in couples with help of volumetric pipettes. After selected the insecticide with the greatest potential in relation to mortality, was determined and sublethal and lethal concentration your tested your effect on oviposition and egg viability. For both the Pironim® repellency as Óleo de Neem Puro® (with the exception of your lowest concentration) was attractive in all concentrations tested. The only one who behaved as repellent in all concentrations was the Rotenona®. Neem Oil has provided a higher rate of mortality in all concentrations when compared to other insecticides tested. The nim also negatively affected females by reducing the number of posture and the viability of the eggs.