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A survey of 79 fields was conducted between December 1993 and January 1994, to determine the distribution and relative importance of species of the genus Cyperus, to justify developing management strategies in the southeastern of Buenos Aires Province, Argentina. Yellow and purple nutsedge were found 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 crops and associated with one or more of other seven perennial weeds, mainly bermudagrass. Entre dezembro de 1993 e janeiro de 1994, realizou- se um recenseamento para determinar a distribuição e importância relativa de espécies do gênero Cyperus, com o objetivo de justificar o desenvolvimento de estratégias de manejo no sudeste da Província de Buenos Aires. Tiririca-amarela e tiririca-vermelha foram encontradas em 43% e 9%, respectivamente, dos lotes avaliados. Trinta e oito por cento da zona recenseada mostrou uma grande infestação de tiririca-amarela, e em 90% dos casos, esta planta daninha esteve associada a outras espécies perenes, principalmente grama-seda

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