The potential of Acmella oleracea (Jambu) extract in the control of semi-engorged Rhipicephalus sanguineus (Latreille, 1806) (Acari: Ixodidae) female ticks

• Published in: International journal of acarology Vol. 44; no. 4-5; pp. 192 - 197
• Main Authors: de Oliveira, Patrícia Rosa, Anholeto, Luis Adriano, Rodrigues, Rodney Alexandre Ferreira, Bechara, Gervásio Henrique, de Carvalho Castro, Karina Neoob, Camargo Mathias, Maria Izabel
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis 04.07.2018; Taylor & Francis Ltd
• Subjects: Acmella; Data processing; Ethanol; Extract; Females; Mortality; natural compound; potential; Rhipicephalus sanguineus; tick
• ISSN: 0164-7954; 1945-3892
• DOI: 10.1080/01647954.2018.1472637

The present study evaluated the efficacy of Acmella oleracea extract, and the susceptibility of semi-engorged R. sanguineus females exposed to different concentrations of the extract, with lethal concentration 50 % (LC 50 ) and confidence interval 95%. The ticks were mounted on Petri dishes and immersed in the different concentrations of the extract, distilled water or ethanol 50% + DMSO 1% for 5 minutes, dried and kept in BOD incubator for 7 days. The results showed the daily mortality rate among semi-engorged R. sanguineus females at different concentrations of the extract. The mortality data obtained in bioassay 2 were subjected to Probit analysis, through which a LC 50 of 24,883 mg/ml (limits: 22,331 to 28,003 mg/ml) was determined, at a 95% confidence interval. Thus, this study demonstrated the sensitivity and susceptibility of semi-engorged R. sanguineus females to Acmella oleracea extract. The acaricidal potential was effective as from the application of the extract at the concentration of 12.5 mg/ml and was dose-dependent. i.e., higher mortality rates were observed as the concentration increased, with LC 50 of 24,883 mg/ml reaching 100% at the concentration of 100 mg/ml in 24h.