The Botanical Monoterpenes Linalool and Eugenol Flush-Out Nymphs of Triatoma infestans (Hemiptera: Reduviidae)

Monoterpenes are the main components of essential oils. Some members of this chemical family present insecticidal activity. Triatoma infestans (Klug) is the main vector of Chagas disease in Argentina, Bolivia, Paraguay, and Perú. The objective of this work was to evaluate the effect of six monoterpe...

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Bibliographic Details
Published in:Journal of medical entomology 2017-09, Vol.54 (5), p.1293-1298
Main Authors: Moretti, A. N., Seccacini, E. A., Zerba, E. N., Canale, D., Alzogaray, R. A.
Format: Article
Language:English
Subjects:
Acetone
Animals
Chagas' disease
Cineole
Essential oils
Eugenol
Filter paper
Flushing
Insect Control
Insecticides
Laboratories
Linalool
Locomotor activity
Menthol
Monoterpenes
Nymph - growth & development
Pyrethrins
Terpineol
Tetramethrin
Thymol
Triatoma - growth & development
Triatoma infestans
triatomines
VECTOR CONTROL, PEST MANAGEMENT, RESISTANCE, REPELLENTS
Vector-borne diseases
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Summary:Monoterpenes are the main components of essential oils. Some members of this chemical family present insecticidal activity. Triatoma infestans (Klug) is the main vector of Chagas disease in Argentina, Bolivia, Paraguay, and Perú. The objective of this work was to evaluate the effect of six monoterpenes (1,8-cineole, eugenol, linalool, menthol, α-terpineol, and thymol) on the locomotor and flushing out activity of T. infestans. A video tracking technique was used to evaluate the locomotor activity of nymphs exposed to different concentrations of these chemicals applied as films on filter paper. Papers treated with acetone alone were used as negative controls, while solutions of tetramethrin were applied as positive controls. Only linalool and menthol produced hyperactivation. Flushing out was assessed under laboratory conditions using a standardized aerosolization method. All monoterpenes were applied at 1.5 g/m3. 1,8-Cineole, α-terpineol, and thymol flushed out 10% or less nymphs. The average flushing out produced by eugenol was 36.7%. Values of median flushing out time (FT50) could only be calculated for linalool and menthol (16.67 and 42.98 min, respectively). The FT50 value for the positive control tetramethrin (applied at 0.006 g/m3) was 8.29 min. Following these results, the flushing out activity of a mixture of linalool and eugenol was evaluated. The FT50 of this 2:1 linalool:eugenol mixture was 40.73 min. Finally, flushing out assays performed in semifield conditions showed similar results to those obtained at the laboratory.
ISSN:0022-2585
1938-2928
DOI:10.1093/jme/tjx068