A survey of weeds occurring in cassava crops was carried out in the mining region of Diamantina, MG. The counties of Carbonita, Itamarandiba and Capelinha were used in the survey and considered to be representative of the region. The degree of abundance and the frequency of weed species were determined. The weeds were identified and most of them are being preserved in the Herbarium ESAL, of the Escola Superior de Agricultura de Lavras, MG. The results showed the occurrence of 45 weed species belonging to 19 families, being 16 dycots, 2 monocots and 1 pteridophyta. The families Compositae, Gramineae, Malvaceae, Leguminosae, Rubiaceae and Convolvulaceae and the species Acanthospermum australe, Sida rhombifolia e Borreria alata occurred with high frequency.
survey; weeds; cassava