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Abstraclt In order to investigate an effective control method of blackfly onchocerciasis endemic area of Guatemala, Iarge scale stream tests in the rainy season using various forrnulations of temephos. The contemephos had no relationship with its carry within a range of O.2-2.0 There existed a clear tendency in that the larger the water discharge, xsTas the carry of the insecticide. No distinct difference was observed in among the four formulations, i.e. solid, water dispersible powders (wdp), concentrates (EC) and oil soJution, as also between the two application mstantaneous pourin.cr. and pouring during a 10rnin period. It is recomthat in future vector control operations of Guatemalan onchocerciasis wdp packed in a ba.cr containing 1.0-1.5g of the active ingredient should into a stream immediately after mixing it with stream water, regardless discharge of stream. With this mode of application, 50-100m carry

Effect of temephos against the blackfly larvae in stream tests in Guatemala