In vitro evaluation of the effects of some acaricides on life stages of Rhipicephalus sanguineus (Acar: Ixodidae)

ABSTRACT

The action of five acaricides was evaluated on eggs, larvae, nymphs and adults of the ixodid tick Rhipicephalus sanguineus. The acaricides tested were high cis-cypermethrin (0.01 per cent) + DDVP (0.11 per cent), coumaphos (0.05 per cent), deltamethrin (0.0025 per cent) and cypermethrin (0.015 per cent). Eggs treated with high cis-cypermethrin and cypermethrin showed eclosion inhibitions of 72.1 per cent and 67.3 per cent, respectively, whereas coumaphos was much less effective (only 11.7 per cent). Except for coumaphos, which resulted in 63.3 per cent and 80.0 per cent mortality of nymphs and unfed females, respectively, all compounds tested killed 100 por cento of all tick stages to which they were exposed