Controle da Anticarsia gemmatalis e compatibilidade do Metarhizium rileyi com óleo essencial de mentha X piperita

Abstract

This work aims to evaluate the bioactivity of the essential oil of M. piperita in the control of A. gemmatalis. The oil presented menthol (20.55 %), mentofuran (13.89 %) and menthone (7.23 %). In the bioassays, the EO concentrations were (0.1; 0.5; 1.0; 1.5 and 2.0 % v/v) and Tween-80® (0.5 % v/v), which were incorporated on an artificial diet. A negative control was performed with water and a positive control with the chemical insecticide Rimon Supra® (novaluron - 0.075 % v/v). For the test with M. rileyi, EO was used at the concentrations already mentioned, Tween-80® (0.5 % v/v) and Rimon Supra®, diluted in culture medium, later a disc of the fungus colony was inserted in the center of the plates and later incubated in BOD. In the evaluations of the bioassays with A. gemmatalis, in 24 h, mortality of 100 % of the individuals was observed from the concentration of 1.0 % v/v and 7.5 % in the concentration of 0.5 % v/v. At 48 h, mortality was 57.5 % of individuals at 0.5 % v/v and at 72 h and 96 h mortality was 65% at 0.5% v/v. In the positive control, a mortality rate of 47.5 % was observed in 48 h, 85 % in 72 h and 92.5 % in 96 h. No growth of the fungus M. rileiy was observed in the tests performed. Thus, it is concluded that the essential oil of M. piperita has insecticidal potential against A. gemmatalis and its use associated with the entomopathogenic fungus M. rileiy would not be indicated. [resumo fornecido pelo autor]