title: Chemical characterization and acaricide potential of essential oil from aerial parts of Tagetes patula L. (Asteraceae) against engorged adult females of Rhipicephalus sanguineus (Latreille, 1806).
abstract: Rhipicephalus sanguineus, commonly known as the brown dog tick, is one of the most widely distributed species of tick. In dogs, it can cause anemia and provide the transmission of pathogenic microorganisms such as Babesia canis, Ehrlichia canis, Hepatozoon canis, Anaplasma platys, and Mycoplasma haemocanis. To man, it can transmit the intracellular parasites Rickettsia rickettsii and Rickettsia conorii, the causative agents of the Rocky Mountain spotted fever in the Americas and Mediterranean and spotted fever in Europe and North Africa. Its control is performed by applying synthetic formulations composed of pyrethroids; however, continued use of these products results in environmental damage and acquisition of resistance. Alternatively, studies with botanical insecticides have been increasingly recurrent. Therefore, this study aimed to test the efficacy of essential oil of Tagetes patula, a ruderal species widely described in the literature for its insecticidal properties, in engorged females of R. sanguineus by the adults immersion test (AIT) and impregnated paper disk test (IPDT). The essential oil used, through gas chromatography coupled to mass spectrometry, revealed the presence of 55 compounds, being the 4-vinyl guaiacol and gamma terpinene the majority ones. The AIT compared to the IPDT was more efficient in inhibiting oviposition of tick; however, the eggs laid by the females submitted to saturated atmosphere with essential oil, from IPDT, not hatched, interrupted their development cycle. Besides being a pioneer work, the results presented here contributes to new researches, aiming the incorporation of essential oil in an acaricide for use in the environment.
authors.affiliation: Department of Drugs and Medicines, School of Pharmaceutical Sciences, UNESP-Univ Estadual Paulista, Rodovia Araraquara-Jaú, Km 1, 14801-902, Araraquara, Sao Paulo, Brazil.
authors.forename: Flávio Augusto Sanches
authors.initials: FA
authors.lastname: Politi
authors.forename: Tatiana Maria
authors.initials: TM
authors.lastname: de Souza-Moreira
authors.forename: Edvânio Ramos
authors.initials: ER
authors.lastname: Rodrigues
authors.forename: Geisiany Maria
authors.initials: GM
authors.lastname: de Queiroz
authors.forename: Glyn Mara
authors.initials: GM
authors.lastname: Figueira
authors.forename: Ana Helena
authors.initials: AH
authors.lastname: Januário
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Berenger
authors.forename: Cristina
authors.initials: C
authors.lastname: Socolovschi
authors.forename: Philippe
authors.initials: P
authors.lastname: Parola
authors.forename: Rosemeire Cristina Linhari Rodrigues
authors.initials: RC
authors.lastname: Pietro
mesh_terms: D056810:Acaricides / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D000818:Animals; D004199:Disease Vectors; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D009822:Oils, Volatile / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D010058:Oviposition / Q000187:drug effects; D021261:Parasitic Sensitivity Tests; D048508:Rhipicephalus sanguineus / Q000187:drug effects*; D016019:Survival Analysis; D031686:Tagetes / Q000737:chemistry*
chemical_list: D056810:Acaricides; D009822:Oils, Volatile