Acaricidal effects of fenvalerate and cypermethrin against Rhipicephalus (Boophilus) annulatus

摘要

The acaricidal effects of two most commonly used acaricides viz., fenvalerateand cypermethrin against Rhipicephalus (Boophilus) annulatus were studied using AdultImmersion Test (AIT). The LC50 values observed for fenvalerate and cypermethrin were 1570ppm and 184 ppm respectively. The death of ticks was not an immediate process. Fenvaleratecaused death only after 7 days while cypermethrin after 5 days of treatment. The eggs laid bytreated ticks did not hatch at all concentrations tested.