scholarly journals A Revision of the Infraspecific Taxonomy of Cyperus esculentus (Yellow Nutsedge) with an Experimentally Evaluated Character Set

1995 ◽  
Vol 20 (4) ◽  
pp. 461 ◽  
Author(s):  
Peter Schippers ◽  
Siny J. Ter Borg ◽  
Jan Just Bos
Keyword(s):  
Cyperus Esculentus ◽  
Yellow Nutsedge ◽  
Character Set ◽  
Infraspecific Taxonomy

Yellow Nutsedge (Cyperus esculentus) Control in Peanuts (Arachis hypogaea)

1992 ◽  
Vol 6 (1) ◽  
pp. 108-112 ◽  
Author(s):  
W. James Grichar
Keyword(s):  
Arachis Hypogaea ◽  
Field Studies ◽  
Cyperus Esculentus ◽  
Yellow Nutsedge ◽  
Moisture Conditions ◽  
Competitive Nature

Field studies were conducted from 1986 through 1988 to evaluate various herbicides for yellow nutsedge control and peanut yields. Three applications of pyridate provided control comparable to two applications of bentazon with yellow nutsedge regrowth beginning 3 to 4 wk after application depending on moisture conditions. Crop oil concentrate did not improve the activity of pyridate. Flurtamone provided control comparable with that of metolachlor. Nutsedge control with fomesafen was erratic with peanut injury noted. Peanut yields did not reflect the competitive nature of nutsedge.

scholarly journals Evaluation of Landscape Fabrics in Suppressing Growth of Weed Species

1991 ◽  
Vol 9 (1) ◽  
pp. 38-40 ◽  
Author(s):  
Chris A. Martin ◽  
Harry G. Ponder ◽  
Charles H. Gilliam
Keyword(s):  
Weed Suppression ◽  
Sorghum Halepense ◽  
Cyperus Esculentus ◽  
Weed Species ◽  
Cassia Obtusifolia ◽  
Yellow Nutsedge

Abstract Two tests were conducted to evaluate weed penetration up through landscape fabrics. The degree of weed suppression varied depending on the specific landscape fabric. No landscape fabric gave total suppression of weeds tested. Sicklepod (Cassia obtusifolia L.) and smallflower morningglory (Jacquemontia tamnifolia (L.) Grisebach.) were inhibited by all landscape fabrics. Growth of pigweed (Aranthus sp.), bermudagrass (Cynodon datylon (L.) Persoon.), yellow nutsedge (Cyperus esculentus L.), and johnsongrass (Sorghum halepense (L.) Persoon.) was suppressed by certain landscape fabrics.

scholarly journals First Report of Yellow Nutsedge (Cyperus esculentus) and Purple Nutsedge (C. rotundus) in Georgia Naturally Infected with Impatiens necrotic spot virus

Plant Disease ◽  
2004 ◽  
Vol 88 (7) ◽  
pp. 771-771 ◽  
Author(s):  
N. Martínez-Ochoa ◽  
S. W. Mullis ◽  
A. S. Csinos ◽  
T. M. Webster
Keyword(s):  
Southeastern United States ◽  
Impatiens Necrotic Spot Virus ◽  
Cyperus Esculentus ◽  
Necrotic Spot ◽  
Rt Pcr ◽  
Spot Virus ◽  
Black Shank ◽  
Purple Nutsedge ◽  
Yellow Nutsedge ◽  
Das Elisa

Impatiens necrotic spot virus (INSV), family Bunyaviridae, genus Tospovirus, is an emerging virus found mostly in ornamentals under greenhouse production. INSV has been detected in peanut (Arachis hypogaea L.) in Georgia and Texas (3) and recently in tobacco (Nicotiana tabacum L.) in the southeastern United States (2) but little is known about INSV distribution and impact on these crops. Noncrop plant hosts are likely to contribute to disease spread by serving as reservoirs for the virus and reproductive hosts for thrips (Frankliniella occidentalis Pergande), which transmit the virus. Yellow nutsedge, a native of North America, and purple nutsedge introduced from Eurasia, are considered serious weed problems in the southeastern United States. To date, there are no reports of natural INSV infections in these weeds. A survey was conducted at two research farms in Tift County, Georgia to determine if yellow and purple nutsedge plants were naturally infected with Tomato spotted wilt virus (TSWV) and INSV. The first field at the Black Shank Farm had been planted with flue-cured tobacco K-326 earlier in the year and fallow at the time of sampling. The second field at the Ponder Farm was planted at the time of sampling with yellow squash (Cucurbita pepo L.) and cabbage (Brassica oleracea L.). In early October 2002, 90 nutsedge plants were taken at random from each site. Leaf and root tissues of each of the nutsedge plants were tested for TSWV and INSV using double-antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA) alkaline phosphatase antisera kits (Agdia Inc., Elkhart, IN). No visible symptoms of INSV or TSWV were observed. Samples from the field at the Black Shank Farm resulted in 2 of 26 positive for INSV in purple nutsedge plants and 6 of 64 in yellow nutsedge plants. At the Ponder Farm, 3 of 12 were positive for INSV in purple nutsedge plants and 14 of 78 in yellow nutsedge plants. None of the samples in either site tested positive for TSWV. The DAS-ELISA positive samples were verified for INSV using reverse transcription-polymerase chain reaction (RT-PCR) as previously described by Dewey et al. (1). Total RNA extracts were obtained from the DAS-ELISA positive nutsedge samples using RNeasy extraction kits (Qiagen Inc., Valencia, CA). The RT-PCR was carried out with primer 1F: 5′-TCAAG(C/T) CTTC(G/T)GAA(A/G)GTGAT 3′ (1) and primer 2R: 5′-ATGAACAAAGCAAAGATTACC 3′ specific to the 3′ end of the INSV N gene open reading frame (GenBank Accession No. NC003624). DAS-ELISA negative tissues of Cyperus esculentus L. and Emilia sonchifolia (L.) DC and an E. sonchifolia DAS-ELISA positive for INSV were included in the reactions as controls. All of the DAS-ELISA positive nutsedge samples yielded an amplification product with the expected size of 298 bp when PCR products were resolved by agarose (0.7%) gel electrophoresis. The relatively high occurrence of INSV found in the sampled fields may explain the recent increase in incidence of INSV in susceptible field crops. Although yellow nutsedge is more common than purple nutsedge in North America, the potential for dispersal of INSV in both species could be significant because of the nature of nutsedge tuber survival and spreading capabilities. References: (1) R. A. Dewey et al. J. Virol. Methods 56:19, 1996. (2) N. Martínez-Ochoa et al. On-line publication. doi:10.1094/PHP-2003-0417-01-HN. Plant Health Progress, 2003. (3) S. S. Pappu et al. Plant Dis. 83:966,1999.

Effects of Glyphosate on Growth and the Chlorophyll and Carotenoid Levels of Yellow Nutsedge (Cyperus esculentus)

Weed Science ◽  
1985 ◽  
Vol 33 (6) ◽  
pp. 751-754 ◽  
Author(s):  
M. J. Cañal Villanueva ◽  
B. Fernandez Muñiz ◽  
R. Sanchez Tames
Keyword(s):  
Root Development ◽  
Foliar Spray ◽  
Dry Weight ◽  
Shoot Formation ◽  
Cyperus Esculentus ◽  
Fresh Weight ◽  
Yellow Nutsedge ◽  
Underground System ◽  
Leaf Dry Weight ◽  
Secondary Shoot

Growth and the chlorophyll and carotenoid contents were measured in greenhouse-grown yellow nutsedge (Cyperus esculentusL. ♯ CYPES), following treatment with glyphosate [N-(phosphonomethyl)glycine]. Herbicide was applied as a foliar spray at concentrations of 0.1, 1.0, 5.0, and 10.0 mM. After 2 weeks, growth was inhibited, and chlorosis and leaf apex necrosis were observed. Plant height was reduced, leaf fresh weight was decreased by 40%, and leaf dry weight was slightly affected. Rhizome, tuber, and secondary shoot formation was strongly inhibited, but root development was not affected by glyphosate treatment. With the 10-mM treatment, dry weight of the underground system was reduced by 80%. Chlorophyll and carotenoid levels were decreased by 52 and 54%, respectively, following glyphosate treatment.

Yellow Nutsedge (Cyperus esculentus) Control in Peanut (Arachis hypogaea) as Influenced by Method of Metolachlor Application

1996 ◽  
Vol 10 (2) ◽  
pp. 278-281 ◽  
Author(s):  
W. James Grichar ◽  
A. Edwin Colburn ◽  
Paul A. Baumann
Keyword(s):  
Arachis Hypogaea ◽  
Field Studies ◽  
Cyperus Esculentus ◽  
Yellow Nutsedge

Field studies conducted from 1989 through 1991 evaluated methods of metolachlor application including POST followed by irrigation for yellow nutsedge control and peanut response. Metolachlor PPI stunted peanut in two of three years while metolachlor applied at emergence, 10, 20, or 30 days after peanut emergence (DAE) caused no peanut injury. Metolachlor 20 DAE provided > 95% yellow nutsedge control. Metolachlor soil-applied and again POST controlled yellow nutsedge at least 70%; however, some peanut stunting was noted. Bentazon plus metolachlor at 2.24 kg ai/ha controlled yellow nutsedge at least 92% when applied 30 DAE. Peanut yields were consistently the highest with metolachlor PRE at 1.40 kg ai/ha followed by a POST application of 1.40 kg ai/ha at 45 DAE.

Response of Purple and Yellow Nutsedge to Dichlobenil

Weed Science ◽  
1968 ◽  
Vol 16 (3) ◽  
pp. 339-340 ◽  
Author(s):  
W. S. Hardcastle ◽  
R. E. Wilkinson
Keyword(s):  
Cyperus Rotundus ◽  
Cyperus Esculentus ◽  
Purple Nutsedge ◽  
Yellow Nutsedge

Purple nutsedge (Cyperus rotundus L.) and yellow nutsedge (Cyperus esculentus L.) tubers were stored at 5 C in soil treated at 0, 2, 3, 4, 6, 8, or 10 lb/A 2,6-dichlorobenzontrile (dichlobenil) for 2, 4, 6, 8, 10, or 12 weeks. Respiration of dormant tubers differed with species, unaffected by period of storage or dichlobenil concentration. Sprouting of untreated tubers decreased from 90% after 2 weeks storage to 43% after 12 weeks. Yellow nutsedge sprout production was uniform in time; purple nutsedge sprouting progressed to an 8-week high. Increased concentrations of dichlobenil progressively inhibited sprouting.

Cercospora Caricis from Cyperus Esculentus (Yellow Nutsedge): Morphology and Cercosporin Production

Mycologia ◽  
1988 ◽  
Vol 80 (3) ◽  
pp. 418-421 ◽  
Author(s):  
Carol L. Blaney ◽  
C. Gerald Van Dyke ◽  
Larry F. Grand
Keyword(s):  
Cyperus Esculentus ◽  
Yellow Nutsedge

Control of Nutsedge with Organic Arsenical Herbicides

Weed Science ◽  
1971 ◽  
Vol 19 (5) ◽  
pp. 601-606 ◽  
Author(s):  
P. E. Keeley ◽  
R. J. Thullen
Keyword(s):  
Cyperus Rotundus ◽  
Growth Chamber ◽  
Cyperus Esculentus ◽  
Purple Nutsedge ◽  
Yellow Nutsedge

Nonradioactive and14C-labeled arsenical herbicides were applied to foliage of purple nutsedge (Cyperus rotundusL.) and yellow nutsedge (Cyperus esculentusL.) grown under greenhouse and growth chamber conditions. Disodium methanearsonate (DSMA) controlled purple nutsedge better at 20 and 29 C than at 13 C. Monosodium methanearsonate (MSMA) was as effective in controlling this weed at 13 C as at 20 and 29 C. DSMA and MSMA provided 80% or greater control of yellow nutsedge grown at the three temperatures. When plants were treated with14C-DSMA and14C-MSMA, greater radioactivity was detected in yellow nutsedge than in purple nutsedge. The apparent differential herbicide penetration of purple and yellow nutsedge leaves is believed to have contributed substantially to the control of nutsedge observed in this study.

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