Acaricidal activity of three plants extracts from the central region of Burkina Faso on adult <I>Rhipicephalus (Boophilus) microplus</I> cattle ticks

the most important and harmful tick species in the livestock sector in Burkina Faso today. This tick has developed resistance to most classes of synthetic acaricides. The objective of this work is to assess the efficiency of plant extracts on this tick to find an alternative. Thus, the acaricidal activity of hydroethanolic and hexanic extracts of Ocimum americanum .L, Ocimum gratissimum .L and Laggera oloptera (DC) Adams was evaluated on adults of this tick by the adult immersion method. The mortality, the inhibition of the laying, the hatching rate, and the effectiveness of each extract have been evaluated with concentrations at 100 mg/mL and at 200 mg/mL, respectively. The best mortality rate was 56%, with the hydroethanolic extract of L. oloptera at 200 mg / mL. The hydroethanolic extract of O. gratissimum was most effective with the best rates of egg inhibition and hatching rates at 200 mg / mL. The results of this study could be used for the development of new bio-acaricide formulations to fight against the tick R. (Boophilus) microplus effectively.Keywords: Ticks, O. gratissimum, O. americanum, Laggera oloptera, phytochemical screening