Atividade de óleos essenciais e compostos majoritários de plantas das famílias Piperaceae, Myrtaceae e Rutaceae sobre Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)

Abstract

The fall armyworm, Spodoptera frugiperda (J.E Smith) (Lepidoptera: Noctuidae), is a polyphagous pest whose control has been carried out mainly with synthetic chemical insecticides. Essential oils have been presented as an alternative to this control method. Thus, the aim of this study was to determine the effect of essential oils and compounds selected from species of the family Piperaceae, Myrtaceae e Rutaceae on S. frugiperda. Toxic activities and deterrent feed were determined and compared those demonstrated by botanical insecticide Azamax and synthetic insecticide Decis 25 EC. Toxicity was evaluated via ovicida and via residual toxicity and topical contact to third instar caterpillars. Regarding the residual toxic activity essential oil of Piper aduncum sheets (LC50= 11.42 mg/mL) was the most toxic, and safrole constituent (LC50= 13.92 mg/mL). In the toxic activity tests via topical contact, the toxicity of the treatments did not change with time (48, 72 and 96h), except Safrole constituent and essential oil Citrus aurantium var. dulcis shell which increased over time. Essential oils extracted from the leaves of Eucalyptus citriodora (LC50=5.04mg/mL), and the constituent S- citronellal (LC50=2.71mg/mL) they stood in ovicidal activity test. Much of the tested treatments had similar toxicity to or greater than the botanical insecticide Azamax, and carrying great potential for use in pest control and insecticide formulation, especially in the control of S. frugiperda.