EFFICACY OF TETRACHLORVINPHOS-IMPREGNATED CATTLE EAR-TAGS AGAINST LIVESTOCK DIPTERA IN SOUTHERN QUEBEC

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Abstract
Tagging of pastured cattle with one tetrachlorvinphos-impregnated (13.7%) ear-tag per animal resulted in an average 95.9% reduction of horn flies over a 14-wk period. A reduction in the numbers of face flies (84.3%), house flies (65.9%), and stable flies (60.3%) was also achieved. Key words: Tetrachlorvinphos, ear-tags, cattle, Diptera