Caracterização Química E Efeito Do Óleo Essencial De Erva-De-Santa-Maria Sobre O Ácaro-Rajado De Morangueiro

Abstract

RESUMO-O ácaro-rajado, Tetranychus urticae Koch (1836) (Acari: Tetranychidae), é a principal praga na cultura do morangueiro. O objetivo deste trabalho foi a caracterização química do óleo essencial de Chenopodium ambrosioides L. e a avaliação de seus efeitos sobre o ácaro-rajado. Os compostos do óleo essencial foram identificados pelas análises de CG-DIC e CG-EM. A mortalidade e a oviposição foram avaliadas após a pulverização do óleo (2,5; 5,0; 7,5 e 10,0% v v -1 ) sobre fêmeas do ácaro-rajado. O rendimento do óleo essencial foi de 0,3%, e os compostos identificados foram (Z)-ascaridol (87%), (E)-ascaridol (5,04%), p-cimeno (4,83%), α-terpineno (1,24%) e piperitona (0,7%). Os maiores valores para mortalidade e redução de oviposição observados foram 85% e 69%, respectivamente. O óleo essencial de C. ambrosioides é uma opção promissora para o manejo do ácaro-rajado. Termos para Indexação: óleo volátil; Chenopodium ambrosioides; bioacaricida; Tetranychus urticae. CHEMICAL CHARACTERIZATION AND EFFECT OF ESSENTIAL OIL FROM MEXICAN-TEA ON TWOSPOTTED SPIDER MITEABSTRACT-The twospotted spider mite, Tetranychus urticae Koch (1836) (Acari: Tetranychidae), is the major pest in strawberry. The objective of this study was the chemical characterization of the essential oil of Chenopodium ambrosioides L. and the evaluation of their effects on twospotted spider mite. The compounds of the essential oil were identified by GC/FID and GC/MS analysis. The mortality and oviposition were evaluated after spraying the oil (2.5, 5.0, 7.5 and 10.0% v v -1 ) on twospotted spider mite females. The yield of the essential oil was of 0.3% and the compounds identified were (Z)-ascaridol (87%), (E)-ascaridol (5.04%), p-cymeno (4.83%), α-terpinene (1.24%) and piperitone (0.7%). The highest values for mortality and reduction of oviposition observed were 85% and 69%, respectively. C. ambrosioides essential oil is a promising option for the management of twospotted spider mite.

Tópicos em Agroecologia - Volume 2

“…Para o controle do ácaro rajado, inúmeras plantas têm demonstrado potencialidade e atividade acaricida através da utilização de seus óleos essenciais e extratos, provenientes do seu metabolismo secundário. Pesquisas tem demonstrado a atividade sobre o T. urticae, dos óleos essenciais de folhas de Piper macedoi e Piper arboreum, de folhas de erva -de -santamaria, de folhas de eucalipto, de gengibre, de folhas de manjericão, de tomilho, alecrim, tangerina, dentre outros (BORN, 2012;PAES et al, 2015;LIMA, 2020).…”

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“…Under severe infestations, these can cause early defoliation, affecting productivity [3] . The occurrence of this mite is reported in regions of hot and humid climate, mainly during the hottest periods of the year [4] . Chemical control is one of the most used methods in the agricultural environment and, although these synthetic insecticides are relatively successful in agriculture, Van Leeuwen et al [5] and Mercês et al [6] claim that their intensive use can cause problems such as the resurgence of the target pest, the appearance of new pests and the selection of populations resistant to the active principle or the mechanism of action.…”

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“…Among these techniques, the use of insecticidal plants stands out. Research related to the use of extracts and substances of plant origin as an alternative management has shown high efficiency in the control of mites and insects [4,7] . It is known that plants are capable of producing secondary metabolites, which are substances responsible for its defense against insects, mites and pathogenic microorganisms.…”