Ntondini, Z.Van Dalen, E.M.S.P.Horak, Ivan Gerard2009-04-252009-04-252008Ntondini, Z, Van Dalen, EMSP & Horak, IG 2008, ‘The extent of acaricide resistance in 1-,2- and 3 –host ticks on communally grazed cattle in the eastern region of the Eastern Cape Province, South Africa’, Journal of the South African Veterinary Association, vol. 79, no. 3, pp. 130-135. [http://www.journals.co.za/ej/ejour_savet.html]0038-28097102989086http://hdl.handle.net/2263/9761In order to determine the extent of acaricide resistance in the eastern region of the Eastern Cape Province 1-, 2- and 3-host ticks were collected from cattle at 59 dip-tanks over a period of 2 years. These ticks were tested for resistance against 3 compounds, namely amitraz, cypermethrin and chlorfenvinphos. The Shaw Larval Immersion Test detected emerging resistance to amitraz in Rhipicephalus (Boophilus) microplus at 2 dip-tanks and resistance at a 3rd. It also revealed resistance in this tick to cypermethrin at 1 dip-tank and emerging resistance to chlorfenvinphos at 8 dip-tanks and resistance at 2. Rhipicephalus evertsi evertsi was susceptible to amitraz and cypermethrin at all dip-tanks, but showed emerging resistance to chlorfenvinphos at 7 dip-tanks and resistance at 4. Rhipicephalus appendiculatus was susceptible to amitraz and chlorfenvinphos at all dip-tanks and demonstrated emerging resistance to cypermethrin at 1.With the exception of R. (B.) microplus, in which emerging resistance to amitraz was detected at 1 dip-tank by the Reproductive Estimate Test, all 3 tick species at all dip-tanks at which sufficient numbers of ticks had been collected were susceptible to the 3 acaracides in both the Egg Laying Test and the Reproductive Estimate Test. The localities at which acaricide resistance was recorded were mapped.enSouth African Veterinary AssociationAcaricide resistanceAmitrazChlorfenvinphosCypermethrinEastern Cape Province, South AfricaIxodid ticksRhipicephalus appendiculatusRhipicephalus (Boophilus) microplusRhipicephalus evertsi evertsiTicks -- South AfricaHost-parasite relationshipsIxodidaeCattle -- ParasitesArticle