Avaliação dos efeitos ecotoxicológicos do inseticida fipronil sobre as espécies Sinella curviseta e Folsomia candida (Hexapoda, Collembola) em solo natural de ecossistema tropical

Abstract

Even with restricted use in the European Union, the active ingredient (a.i.) fipronil is still widely used in Brazil , because it is an insecticide with a broad spectrum of action. It is a compound widely used in sugarcane crops to combat the damage caused by predatory organisms in these plantations. However, little is known about how it affects soil organisms. In order to observe the effects of the pesticide REGENT 800 WG (i.a. fipronil) on soil invertebrates, tests to evaluate the reproduction of the springtail species F. candida and S. curviseta were carried out in oxisol. The concentrations chosen for the tests were 0.21; 0.31; 0.46; 0.69; 1.04 mg of fipronil. kg1

of soil for F. candida and 0.69; 1.04; 1.56; 2.33; 3.50 mg of

fipronil. kg1

of soil for S. curviseta, which were based on the recommended dose for application in sugarcane crops, in order to eliminate the damage caused to crops by the beetle Midgdolus fryanus. The results obtained showed that F. candida were significantly affected at the concentration of 0.69 mg fipronil.kg-1 of soil (half the recommended dose), with a 53% decrease in reproduction and 46% mortality. While the species S. curviseta did not show negative effects at the concentrations tested. Demonstrating that non-target organisms are greatly affected by compounds used to eliminate predatory organisms from agricultural crops. It was analyzed that organisms from the same groups may have different sensitivities.