In Vitro Effect of Volatile Substances from Eucalyptus Oils on Rhipicephalus microplus
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In Vitro Effect of Volatile Substances from Eucalyptus Oils on Rhipicephalus microplus Leandro Rodrigues 1 & Rodrigo Giglioti 1 & Ana Carolina Peroni Gomes 1 Ivani Pozar Otsuk 1 & Renata da Silva Matos 2,3 & Elen Fernanda Nodari 2
Luciana Morita Katiki 1 & 1 & Cecília José Veríssimo
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Received: 23 January 2020 / Accepted: 27 August 2020 / Published online: 6 October 2020 # Sociedade Brasileira de Farmacognosia 2020
Abstract Volatile oils have been extensively investigated as an alternative for tick control. This study evaluated the in vitro effects of volatile compounds emanated by Corymbia citriodora (Hook.) K.D.Hill & L.A.S.Johnson and Eucalyptus globulus Labill., Myrtaceae, volatile oils and their major compounds, citronellal and 1,8-cineole, respectively, at doses of 10, 20, 40, 60, 80 and 100 mg/g, on Rhipicephalus microplus larvae and engorged females. The effects of these volatile oils were compared with those of commercial acaricides. In bioassays with engorged females, percentages of oviposition inhibition (OI %) and efficacy of the product (EP %) were determined, as well as tick larval mortality. The larval tests with citronellal presented high mortalities (> 80%) for all analysed doses, except 10 mg/g, while those for 1,8-cineole at the lowest dose (10 and 20 mg/g) produced the highest mortality (> 85%). In general, the volatile compounds released by these oils resulted in larval mortality and inhibition of the reproductive parameters in the engorged females, with efficacies over 80%. Keywords Acaricidal activity . Volatile oils . Alternative control . Ticks
Introduction Rhipicephalus microplus is an ectoparasite that damages cattle health and has negative economic impacts on livestock. Grisi et al. (2014) estimated that ticks and the efforts to control them mobilise more than 3 billion dollars per year by losses and expenses in tropical environments. Currently, tick control is performed almost exclusively through the use of chemicals, and the continuous and inadequate use of chemical products has led to the appearance of genetic resistance of R. microplus Electronic supplementary material The online version of this article (https://doi.org/10.1007/s43450-020-00091-9) contains supplementary material, which is available to authorized users. * Rodrigo Giglioti [email protected] 1
Centro de Pesquisa de Genética e Reprodução Animal, Instituto de Zootecnia, Rua Heitor Penteado 56, Nova Odessa, SP 13380-011, Brazil
2
Departamento de Biologia, Instituto de Biociências, Universidade Estadual Paulista, Rio Claro, SP, Brazil
3
Departamento de Comportamento e Biologia Animal, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
to most commercial acaricides. Volatile oils from Eucalyptus species have demonstrated an in vitro activity in tick control (Chagas et al. 2002; Costa et al. 2008). These authors found positive effects of Eucalyptus globulus Labill., Myrtaceae, and Corymbia citriodora (Hook.) K.D.Hill & L.A.S.Johnson, Myrtaceae, volatile oils and their major c
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