Title: Susceptibility of a dieldrin-resistant and a susceptible strain of the tick Rhipicephalus evertsi evertsi Neumann, 1897 from East Africa, to carbamate and organophosphorus acaricides Lourens JHM Ref: Pest Sci, 10:495, 1979 : PubMed
A dieldrin-resistant and a susceptible strain of the tick Rhipicephalus evertsi evertsi Neumann, 1897 from East Africa were compared for susceptibility to nine organophosphorus and a carbamate acaricides, using an internationally approved oil-based packet test. As only minor differences in response existed between the strains, the presence of cross resistance may be excluded. For some of the acaricides, distinct susceptibility classes were recognised which were probably genetically determined. The tolerances existed independently of the organochlorine-susceptibility status and were low (by a factor less than 3), except in the case of dimethoate for which resistance factors of up to 10 were present. As susceptibility data were not assessed prior to introduction of the compounds in the field, the lowest susceptibility classes may now be considered as providing baseline data. When compared with data from susceptible reference strains of other ticks such as Boophilus microplus from Australia and R. appendiculatus from East Africa, it is feasible that the tolerances observed in the laboratory will not interfere with practical control.
        
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Lourens JHM (1979) Susceptibility of a dieldrin-resistant and a susceptible strain of the tick Rhipicephalus evertsi evertsi Neumann, 1897 from East Africa, to carbamate and organophosphorus acaricides Pest Sci10: 495-501