Yellow and purple nutsedges survey in the southeastern Buenos Aires Province, Argentina

A survey of 79 fields was conducted between December 1993 and January 1994, to determine the distribution and relative importance of species of the ge nus Cyperus, to justify developing management strategies in the southeaster n of Buenos Aires Province, Argentina. Yellow and purple nutsedge were foun d in 43% and 9% respectively of the surveyed fields. Thirty eight per cent of the surveyed area showed a heavy infestation of yellow nutsedge, and in 90% of cases yellow nutsedge was invading fields cultivated with summer cro ps and associated with one or more of other seven perennial weeds, mainly b ermudagrass.