Abstract

MOJICA, Marycruz et al. Repellent activity of Amomyrtus Meli, Peumus Boldus and Senecio Nutans essential oils, on triatoma infestans (Hemiptera: Reduviidae). Rev. Cien. Tec. In. [online]. 2022, vol.20, n.26, pp.89-100. ISSN 2225-8787.  https://doi.org/10.56469/rcti.vol20n26.708.

Triatoma infestans, is the main vector of Chagas disease in Bolivia and neighboring countries. Its control is mainly based on treatments with synthetic insecticides, but there are few studies on the effects of repellents on this species. This paper aimed at evaluating the repellent activity of essential oils (EOs) from native species of Chile, Argentina and Bolivia: Amomyrtus meli (Phil.) D. Legrand & Kausel [Myrtaceae], Peumus boldus Molina [Monimiaceae] and Senecio nutans Sch. Beep. [Asteraceae] obtained by hydrodistillation. The experimental sand consisted of a filter paper that had one half treated with acetone and the other half with an EO solution in acetone. As a positive control, N, N-diethyl-3-methylbenzamide (DEET) was used. A fifth instar nymph of T. infestans was placed on the paper and for ten minutes, the time that the insect was in the area treated with EO or in the alternative zone was recorded. Five concentrations of each EA between 4.12, 8.25, 16.5, 33.0 and 66.0 µg/cm2 were evaluated. All three EOs produced a repellent effect on T. infestans, and their repellency profile was similar to DEET. Future researches should focus on the study of the individualized repellency of the main components of the EO and the toxicological interactions between them when applied as simple mixtures. In particular, synergistic interactions would be an attractive phenomenon for the development of triatomine repellent products

Keywords : Triatoma infestans; essential oils; repellent activity; bioassays.

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