Potential of the insect growth regulator, fluazuron, in the control of Rhipicephalus sanguineus nymphs (Latreille, 1806) (Acari: Ixodidae): Determination of the LD95 and LD50

► This study demonstrated the susceptibility of Rhipicephalus sanguineus nymphs to the fluazuron. ► The LD50 of R. sanguineus nymphs was estimated to be: LD50 = 19.544 mg/kg. ► The LD95 of R. sanguineus nymphs was estimated to be 100 mg/kg. ► The fluazuron may be used to control this tick in this stage of its biological cycle. ► The fluazuron inhibits the synthesis and/or deposition of chitin in the target organisms.