Around three million hectares of cerrado soils in Mato Grosso do Sul State are occupied by annual crops such as black oats, corn and sorghum, where occur weeds. The first requirement for management and control of weeds is the correct identification. The present work is a floristic survey of the weeds of black oats, corn and sorghum crops, in cerrado areas of Mato Grosso do Sul, aiming to know their diversity in each crop and the floristic similarity among them. In the three studied crops a total of 14 families, 47 genera and 66 weed species were found. Black oats presented the highest number of weed species (43), followed by corn (39) and sorghum (29). The main families in number of species were Fabaceae (16), Poaceae (13) and Asteraceae (10). The highest floristic similarity occurred between corn and sorghum (0.588).
annual crops; weed; floristics
