title: Repellence produced by monoterpenes on Rhodnius prolixus (Hemiptera: Reduviidae) decreases after continuous exposure to these compounds.
abstract: Botanical monoterpenes are secondary metabolites present in essential oils produced by plants. Some of them are insect repellents. The bloodsucking bug Rhodnius prolixus Ståhl (Hemiptera: Reduviidae) is one of the main vectors of Chagas disease in the north of South America and some countries in Central America. In this study, we studied the repellence produced by two monoterpenes, menthyl acetate and geraniol, on fifth instar nymphs of R. prolixus. In the absence of other stimuli, both menthyl acetate and geraniol produced a repellent effect from 740 μg/cm(2) and 74 μg/cm(2), respectively. Pre-exposure to each monoterpene reduced the repellent activity produced by the same substance. Additionally, pre-exposure to one monoterpene decreased the behavioral response of the nymphs to the other one. The repellent effect of both monoterpenes also decreased when nymphs' antennae were previously treated with the nitric oxide donor S-nitroso-N-acetyl-cysteine.
authors.affiliation: Cátedra de Sanidad Vegetal, Departamento de Producción Vegetal, Facultad de Ciencias Agrarias, Universidad Nacional del Litoral, Provincia de Santa Fe, Argentina.
authors.forename: Alejandra
authors.initials: A
authors.lastname: Lutz
authors.affiliation: Centro de Investigaciones de Plagas e Insecticidas (CIPEIN-UNIDEF-CONICET), JB de La Salle 4397, (1603) Villa Martelli, Provincia de Buenos Aires, Argentina Instituto de Investigación e Ingeniería Ambiental, Universidad Nacional de San Martín, San Martín, Provincia de Buenos Aires, Argentina.
authors.forename: Valeria
authors.initials: V
authors.lastname: Sfara
authors.affiliation: Centro de Investigaciones de Plagas e Insecticidas (CIPEIN-UNIDEF-CONICET), JB de La Salle 4397, (1603) Villa Martelli, Provincia de Buenos Aires, Argentina Instituto de Investigación e Ingeniería Ambiental, Universidad Nacional de San Martín, San Martín, Provincia de Buenos Aires, Argentina ralzogaray@hotmail.com.
authors.forename: Raúl Adolfo
authors.initials: RA
authors.lastname: Alzogaray
mesh_terms: D000111:Acetylcysteine / Q000031:analogs & derivatives / Q000494:pharmacology; D000818:Animals; D057506:Arthropod Antennae / Q000187:drug effects; D007302:Insect Repellents / Q000494:pharmacology*; D039821:Monoterpenes / Q000494:pharmacology*; D009043:Motor Activity / Q000187:drug effects; D009758:Nymph / Q000187:drug effects / Q000502:physiology; D012239:Rhodnius / Q000187:drug effects* / Q000502:physiology
chemical_list: D007302:Insect Repellents; D039821:Monoterpenes; C024940:S-nitroso-N-acetylcysteine; D000111:Acetylcysteine
keywords: blood-sucking bug; geraniol; menthyl acetate