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Nuria Pascual-Seva, Alberto San Bautista, Salvador V. López-Galarza, José V. Maroto and Bernardo Pascual

Cyperus esculentus L. can be found wild, weedy, or in a cultivated state. It is an abundant weed in all mild and tropical zones and is considered one of the most important and hard-to-control weeds worldwide, although it is not as noxious as

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J.P. Morales-Payan, W.M. Stall, D.G. Shilling, J.A. Dusky and T.A. Bewick

Field trials were conducted in Gainesville, Fla., to determine the influence of nitrogen fertilization on the interference effect of purple or yellow nutsedge on the yield of fresh tomato. Nitrogen (N) rates of 50, 100, 150, 200, 250, 300, and 350 kg·ha–1 were applied broadcast to the soil. Before transplanting, 1-m-wide soil beds were covered with plastic and fumigated with methyl bromide to suppress the growth on undesired weeds. Nutsedge-free and purple or yellow nutsedge-infested tomato plots were separately established. `Solar Set' tomatoes were transplanted in the middle of the soil beds, 50 cm apart in a single row. In nutsedge-infested plots, weed densities known to cause significant yield reduction in tomato (100 purple nutsedge plants/m2 and 50 yellow nutsedge plants/m2) were uniformly established perforating the plastic and transplanting viable tubers in the perforations. Purple and yellow nutsedge tubers were transplanted the same day as tomatoes and were allowed to interfere during the whole crop season. Results indicate that N rates had a significant effect on tomato fruit yield in both nutsedge-free and nutsedge-infested treatments. The presence of either purple or yellow nutsedge significantly reduced the fruit yield of tomato at all N rates. As N rates increased, tomato fruit yield reduction caused by the interference of either nutsedge species also increased. When yellow nutsedge was allowed to interfere with tomato, fruit yield loss was as low as 18% at 50 kg N/ha and as high as 42% at 350 kg N/ha. In purple nutsedge-infested tomato, fruit yield reductions ranged from 10% at 50 kg N/ha to 27% at 350 kg N/ha. N effects on nutsedge-free and nutsedge-infested tomato yields were described by quadratic equations, with maximum tomato fruit yield values being reached between 200 and 250 kg N/ha in both nutsedge-free and nutsedge-infested treatments.

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Milton E. McGiffen Jr., David W. Cudney, Edmond J. Obguchiekwe, Aziz Baameur and Robert L. Kallenbach

Yellow and purple nutsedge are problem perennials that resist common control measures. High temperatures, irrigation, and relatively non-competitive crops combine to greatly increase the severity of nutsedge infestations in the Southwest. We compared the growth and susceptibility of purple and yellow nutsedge to chemical and cultural control measures at several locations in southern California. When not controlled, low initial populations of either species led to heavy infestations later in the season. Purple nutsedge was far more prolific in both tuber production and above-ground growth. Summer rotations that included crops with dense canopies severly decreased nutsedge shoot and tuber growth. Cool-season crops planted into heavy nutsedge infestations in the fall are generally unaffected because nutsedge infestations in the fall are generally unaffected because nutsedge soon enters dormancy and ceases growth. Solarization, or pasteurization of the upper soil layers, was effective in decreasing tuber formation. Tillage effectively spread local infestations over larger areas.

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James P. Gilreath and Bielinski M. Santos

, R.D. 1982 Growth and reproduction of Cyperus esculentus L. and Cyperus rotundus L Weed Res. 22 149 154

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Sanjeev K. Bangarwa, Jason K. Norsworthy and Edward E. Gbur

densities on bell pepper ( Capsicum annuum ) yield as influenced by nitrogen Weed Technol. 12 230 234 Motis, T.N. Locascio, S.J. Gilreath, J.P. Stall, W.M. 2003 Season-long interference of yellow nutsedge ( Cyperus esculentus ) with polyethylene-mulched bell

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James T. Brosnan and Gregory K. Breeden

that a mixture of pyrimisulfan + penoxsulam may provide turfgrass managers an effective option for yellow nutsedge control compared with penoxsulam alone. Table 2. Yellow nutsedge ( Cyperus esculentus L.) control with single and sequential applications

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Matthew A. Cutulle, Gregory R. Armel, James T. Brosnan, Dean A. Kopsell, William E. Klingeman, Phillip C. Flanagan, Gregory K. Breeden, Jose J. Vargas, Rebecca Koepke-Hill and Mark A. Halcomb

combinations with atrazine and bentazon for yellow and purple nutsedge ( Cyperus esculentus and C. rotundus ) control in corn Weed Technol. 22 391 396 Atland, J.E. Gilliam, C.H. Whetje, G. 2003 Weed control in field nurseries HortTechnology 13 9 14 Bachman, G

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Yan Chen, Ronald E. Strahan and Regina P. Bracy

measurement J. Environ. Qual. 25 169 177 Banks, P.A. 1983 Yellow nutsedge ( Cyperus esculentus ) control, regrowth, and tuber production as affected by herbicides Weed Sci. 31 419 422 Bilderback, T.E. Fonteno, W.C. 1993 Impact of hydrogel on physical

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Jose G. Franco, Stephen R. King, Joseph G. Masabni and Astrid Volder

–peanut strip intercropping combination and monocropped pepper had the most broadleaf weeds, 400 and 405 kg·ha −1 , respectively ( Fig. 3B ). The most prevalent sedges were yellow nutsedge ( Cyperus esculentus ) and purple nutsedge ( Cyperus rotundus ) (data not

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Wayne C. Porter

Studies were conducted to evaluate metolachlor for weed control and crop tolerance in sweet potatoes. Metolachlor was applied posttransplant at rates of 0.5, 1.0, or 2.0 lb/A. Tank-mix combinations of metolachlor + clomazone were also evaluated. Clomazone was the standard herbicide used for comparison. Metolachlor alone or in combination with clomazone did not cause any serious reduction in sweet potato plant vigor when applied posttransplant. Metolachlor provided excellent control of Brachiaria platyphylla, Cyperus iria, Cyperus esculentus, and Amaranthus hybridus. Tank-mixes with clomazone did not improve the weed control of metolachlor alone. Yields of No. 1 and marketable roots from metolachlor treated plots were equal to or greater than yields from plots treated with clomazone.