CHEMICAL COMPOSITION AND REPELLENT ACTIVITYOF Senecio pogonias CABRERAS AND Senecio oreophyton J.REMY ESSENTIAL OIL, FROM SAN JUAN, ARGENTINA

ARAGÓN, L.; LÓPEZ SB; LÓPEZ ML; ZYGADLO JA; STARIOLO R; TAPIA A; FERESIN GE

Congreso; XXX Congreso Anual de la Sociedad de Biología de Cuyo; 2012

Chagas disease is a major public health concern in Argentina withestimates near three millions infected people. Essential oils (EO)from two Senecio species (Asteraceae) were assayed in vitro fortheir repellence activity against five instar nymphs of T. infestans,the vector of Chagas disease. Fresh aerial parts collected in SanJuan Province were subjected to hydro distillation for 2 h in a modifiedClevenger apparatus. The composition of the essential oils wasexamined by GC and GC-MS. Twenty nine components were identifiedin the EO from S. pogonias representing 97.6% of the oil and30 components in S. oreophyton oil representing 97.3% of the oil.Main compounds were á-pinene, á-phelandrene and á-pinene andp-mentha-1(7), 8-diene respectively. Repellency on T. infestansnymphs was determined according to a standard method. Based onthe percentage of repellency (RP) in a 72-h treatment, the mostrepellent EO was S. pogonias (60-80% RP) and S. oreophyton (40-60% RP). According to repellency classification scale oils are ClassIV and III respectively.Acknowledgements: Serv. Nac. Chagas, Cba. for providing T.infestans nymphs. Financial support was provided by CICITCA(F887). CONICET (LML, ZJA, GEF).