Howell, C.J.Begemann, G.J.Muir, R.W.Louw, P.Bigalke, R.D.Cameron, Colin McKenzieGilchrist, Frances M.C.Morren, A.J.Verster, Anna J.M.Verwoerd, Daniel WynandWalker, Jane B.Steyn, P.J.J.2016-03-152016-03-1520161981Howell, CJ, Begemann, GJ, Muir, RW & Louw, P 1981, 'The control of Simuliidae (Diptera, Nematocera) in South African rivers by modification of the water flow volume’, Onderstepoort Journal of Veterinary Research, vol. 48, no. 1, pp. 47-49.0330-2465http://hdl.handle.net/2263/51843The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.It was found that the build-up of simuliid numbers subsequent to the construction of dams in the Vaal and Orange Rivers could be successfully prevented by periodic, artificially controlled reductions in the water-levels in these rivers.en©ARC - Onderstepoort and Faculty of Veterinary Science, University of Pretoria (original). ©University of Pretoria. Dept. of Library Services (digital).Veterinary medicineVeterinary medicine -- South AfricaArticle