Fiedler, O.G.H.Alexander, R.A.Clark, R.Louw, J.G.De Kock, V.E.2017-02-062017-02-0620171952Fiedler, OGH 1952, 'The lethal effect of some insecticides on the B.H.C.-resistant blue tick, Boophilus decoloratus Koch’, Onderstepoort Journal of Veterinary Research, vol. 25, no. 4, pp. 65-67.0330-2465http://hdl.handle.net/2263/58862The articles have been scanned in colour with a HP Scanjet 5590; 300dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.D.D.T. and its related compounds seem to be the only group of the new contact insecticides against which the blue tick has not been able to build up any resistance. Toxaphene as well as Parathion are definitely less effective against the B.H.C.-resistant strain and higher concentrations are needed to achieve a good control. Dieldrin and related compounds, which otherwise are very powerful insecticides appear to be of little value for the control of the B.H.C.-resistant blue tick.en© 1952 ARC - Onderstepoort and Faculty of Veterinary Science, University of Pretoria (original). © 2017 University of Pretoria. Dept. of Library Services (digital).Veterinary medicineVeterinary medicine -- South AfricaArticle