INSECTICIDAL AND REPELLENT ACTIVITY OF Tagetes ESSENTIAL OILS FROM TUCUMÁN (ARG.) AGAINST Ceratitis capitata AND Triatoma infestans

LOPEZ SB; J. A. ZYGADLO; ARAGON LILIANA; TERESCHUK M; ALBERTO SLANIS; EGLY FERESIN G; ALEJANDRO TAPIA; LOPEZ MARÍA LIZA

Ciudad de la Punta - San Luis

Simposio; XXVII Annual Scientific Meeting; 2009

We evaluated the toxic and repellent potential of essential oils from Tagetes species from Tucumán, Argentina. Fresh aerial parts were subjected to hydro distillation for 2h in a type Clevenger apparatus. Chemical composition was carried out by GC-MS. The oil yield was 1.34% p/p (6.7 mL) and 0.92% (5.6 mL) for T. minuta and T. rupestris, respectively. Qualitative and quantitative analysis of the essential oils identified 12 components for T. minuta representing 94.75% of the oil and 9 components for T. rupestris, as well as one unidentified peak, representing 96.62% of the oil. Main compounds were: dihydrotagetone, (E) β-ocimene, (Z)-tagetone, (E)-tagetone, (Z) ocimenoneand (E)-, ocimenone. At 24, 48 and 72 hs post- treatment, doses of 50 and 100 ug/insect caused significantly higher mortality than that of the control (from 80 to 96% for T. minuta essential oil and 38 to 78% for T. rupestris essential oil). On the other hand, repellent activity of Tagetes essential oils was assayed against T. infestans according to standard method. Mean repellency was 94.67% and 81.33% for T. minuta and T. rupestris respectively, both equivalent to V class. Acknowledgements: To ProCEM-San Juan who provided C. capitata individiduals and to Serv, Nac. Chagas, Cba., for providing T. infestans nymphs. Financial support was provided by CICITCA (I905), ANPCyT (PICT ´07- 01468) and CONICET (PIP´08 0407).