PROPIEDADES ANTI-INSECTO DE ESPECIES DE TAGETES (ASTERACEAE) SOBRE CERATITIS CAPITATA Y TRIATOMA INFESTANS

SANDRA B. LÓPEZ; MARÍA L. LÓPEZ; LILIANA M. ARAGÓN; MARÍA. L. TERESCHUK; ALBERTO C. SLANIS; JULIO A. ZYGADLO; GABRIELA E. FERESIN; ALEJANDRO A. TAPIA

Córdoba, Argentina

Simposio; X Simposio Argentino-XIII Simposio Argentino Latinoamericano de Farmacobotánica; 2010

Essential oils (EO) are complex mixtures of monoterpenes, sesquiterpenes and phenylpropanoids that exert multiple anti-insect properties. The toxic and repellent effects of EO depend on the chemical composition of the oil and the insect susceptibility. EO from four species of Tagetes collected in Tucumán, Argentina, were evaluated for their toxic and olfactometric activity on Ceratitis capitata adults and repellent properties against Triatoma infestans. The EO were obtained by hydrodistillation and the chemical composition was determined by GC-MS. The monoterpenes represented the main portion of the oils with the exception of T. pusilla, with methyl chavicole and estragole as the main components. The main compounds of the oils were dihydrotagetone, (E)-β-ocimene, (Z)-tagetone, (E)-tagetone, (Z)-ocimenone and (E)-ocimenone with quantitative variations in the relative compositions. Bioassays on C. capitata adults were made by topical application and in a Y-tube olfactometer. The LD50 after 48 h were up to 22.42 mg/insect. Females were more susceptible to the toxic effect of the oils. T. minuta oil attracted only males in the Y-tube olfactometer assays whereas T. terniflora oil attracted both males and females. The EO presented strong repellents properties against T. infestans. Acknowledgements. PICT ´07- 01468, PIP´08 0407, CICITCA-UNSJ-I/905. GF, MLL  and JAZ to CONICET.