Acaricidal Activity of Glycyrrhiza glabra and Terminalia chebula Extracts against Rhipicephalus (Boophilus) microplus (Acari: Ixodidae)

The efficacy of aqueous extract of Glycyrrhiza glabra and methanolic extract of Terminalia chebula were assessed against Rhipicephalus (Boophilus) microplus ticks using adult immersion test (AIT). Efficacy was assessed by estimation of per cent mortality, reproductive index (RI) and inhibition of oviposition (IO). A concentration dependent increase in tick mortality was recorded. Highest mortality of 54.2 and 45.8% were recorded for G. glabra and T. chebula, respectively, at 10% concentration. The LC_5O value was calculated as 11.6% for G. glabra. In comparison to the control ticks, the weight of the egg mass of ticks (treated with extracts) was significantly (p<0.05) lower; hence, the RI values of treated ticks were reduced. Highest IO of 66.1 and 47.4% were recorded for G. glabra and T. chebula, respectively at 10% concentration of the extract. The results showed that the root extracts of G. glabra and T. chebula have acaricidal properties and could be useful for controlling R. (B.) microplus tick, which is an efficient vector of pathogens in cattle.