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Toxic and repellent effects of Baccharis salicifolia essential oil on Tribolium castaneum

2005; Wiley; Volume: 61; Issue: 6 Linguagem: Inglês

10.1002/ps.1028

1526-4998

Matías García, Osvaldo J. Donadel, Carlos E. Ardanaz, Carlos E. Tonn, Marta E. Sosa,

Allelopathy and phytotoxic interactions

Allelochemical effects were observed when Tribolium castaneum (Herbst) adults were treated with Baccharis salicifolia (Ruiz & Pavon) Pers essential oil. The main biological activities were toxicity and repellence. Terpenes present in the essential oil were identified by GC-MS, and some authentic samples were tested to assess their activity individually. The most acutely toxic compounds after 3 days were beta-pinene and pulegone. Most of the monoterpenes elicited symptoms indicative of neurotoxicity. The most repellent compound was alpha-terpineol. Toxic and repellent effects of chemical derivatives of the major sesquiterpene present in B salicifolia essential oil, as well as a series of monoterpenes, were evaluated in order to investigate structure-activity relationships. The reduced derivatives of the monoterpenes and sesquiterpenes were more repellent that their carbonyl analogues. In addition, unsaturation in the germacrane skeleton enhanced repellent activity.