In vitro tests to establish LC50 and discriminating concentrations for fipronil against Rhipicephalus (Boophilus) microplus (Acari: Ixodidae) and their standardization

Effects of fipronil againstRhipicephalus(Boophilus)annulatus

“…The LC 50 value for fipronil against R. (Boophilus) annulatus was determined as 12.78 ppm based on the adult immersion test and is consistent with the LC 50 of 10 ppm against R. sanguineus (Oliveira et al 2008). Previously, LC 50 and LC 99.9 values for fipronil against a susceptible strain of R. (Boophilus) microplus were determined as 0.75 and 2.49 ppm, respectively, using the adult immersion test (Castro-Janer et al 2009). The higher values of LC 50 observed in this study could be the result of the variation in tick species.…”

Influence of essential oil fractionation by vacuum distillation on acaricidal activity against the cattle tick

“…In addition, the parasite causes damage to skin of the cattle directly affecting the value of hides for leather manufacture (García-García et al 1999;Ducornez et al 2005). The economical losses world-over were estimated as $7 billion (Castro-Janer et al 2009) due to this. The most extensively used methods for tick control involve the application of acaricides such as pyrethroids and formamidine, both in the environment and directly on the animal skin.…”

Acaricidal properties of the essential oil and precocene II obtained from Calea serrata (Asteraceae) on the cattle tick Rhipicephalus (Boophilus) microplus (Acari: Ixodidae)

“…It causes severe economic losses by blood loss, reduction in weight gain, direct damage to cattle skin by the tick bite, diminishing the value of skins and hides for the manufacture of leather, and also serving as a vector of infectious disease such as bovine babesiosis and anaplasmosis (Jongejan and Uilenberg, 2004;Castro-Janer et al, 2009;Reck et al, 2009).…”