Composición química y efecto acaricida de los aceites esenciales de Hierba Luisa (Cymbopogon citratus), Ciprés (Cupressus spp.) y flores de Lepechinia mutica Benth sobre larvas de Rhipicephalus (Boophilus).

Abstract

Abstract:The present investigation studied the efficacy in larvae of Rhipicephalus microplus of the essential oils (AEs) of Cupressus macrocarpa, Cymbopogon citratus and Lepechinia mutica Benth. The oils obtained by steam distillation, and the chemical composition determined by analytical techniques: CG-EM and CG-FID. The ticks submitted to the larvae pack test to evaluate the mortality with the AEs. The percentages of major components of C. macrocarpa were: pinene α 13.50, acorenol α 7.40, limonene 5.20 and muurola-3,5-diene cis 5.00; C. citratus: geranial 36.73, neral 30.63, myrcene 19.22, geraniol 3.44 and L. mutica: delta-3-careno 24.2, eudesm-7-en-4-ol 13.0, thujopsan-2-α-ol 11 , 9, β-pinene 8.0, valerianol, limonene and β-phellandrene 4,5. Among all the AEs used, the AE of C. citratus caused the highest mortality at 2% with 78.4%, C. macrocarpa with 30.4% and 29% with the AE of L. mutica. According to the observed mortality levels, that the essential oil of C. citratus is the most promising to used in field-tests for larvae control.