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Chemical composition of the essential oil from Ageratina sp and its repellent effect on Drywood termite Incisitermes marginipennis
Essential oils obtained from new plant species with metabolomes unexplored or poorly known are a natural resource to find molecules with deterrent (irritant) effect. The aim of this study was to evaluate the chemical composition and the termite repellent activity of the essential oils from Ageratina sp. The repellent effect was determined by the pine drywood termite Incisitermes marginipennis behavior of to sense the contact of the tunnel wall in the wooden colony in the presence of an irritant obstacle caused by essential oils. Gas chromatographic analysis of the essential oils from flower, leaf, and stem showed quantitative and qualitative differences in components.
Twenty-eight volatile components were identified by their mass spectra (MS). β-caryophyllene, carvacrol, spathulenol, and terpinen-4-ol were the four major components, of them in relation 0.1 m citronellol, the 0.1 M carvacrol was the best repellent of the termite. Essential oils from Ageratina sp exhibited a termite repellent effect due to their major components. Additionally, more research about the termite repellent action of carvacrol is still needed.