scholarly journals Distribution and Control of Herbicide-Resistant Italian Ryegrass [Lolium perenne L. ssp. multiflorum (Lam.) Husnot] in Winter Wheat (Triticum aestivum L.) in North Carolina

2021 ◽  
Vol 2 ◽  
Author(s):  
Eric A. L. Jones ◽  
Zachary R. Taylor ◽  
Wesley J. Everman
Keyword(s):  
North Carolina ◽  
Winter Wheat ◽  
Coastal Plain ◽  
Weed Management ◽  
Conservation Tillage ◽  
Triticum Aestivum L ◽  
Integrated System ◽  
Italian Ryegrass ◽  
Effective Control ◽  
No Till

Italian ryegrass is consistently ranked as one of the most problematic weeds of winter wheat in the Southeastern United States. To determine the distribution of resistant Italian ryegrass biotypes, seed was collected from locations throughout North Carolina and screened with diclofop, pinoxaden, mesosulfuron, and pyroxsulam. Results identified evidence of resistance to diclofop at all locations sampled throughout the state. Resistance to mesosulfuron, pyroxsulam, and pinoxaden were confirmed in 11, 19, and five percent of sampled locations, respectively. Additionally, Italian ryegrass biotypes resistant to multiple and all herbicides tested were identified, eliminating POST herbicide application as an option for control. Adjusting tillage practices may be an option for sustainable weed management to maintain effective control and maximize crop yield. Companion studies were established in the Coastal Plain and Piedmont regions of North Carolina in 2013 and 2014 to evaluate the effect of tillage on Italian ryegrass efficacy with herbicides. Herbicide treatments consisted of pyroxasulfone PRE only, mesosulfuron, or pinoxaden and POST only applications of mesosulfuron plus pyroxasulfone or pinoxaden plus pyroxasulfone. Tillage treatments included no-till and conservation tillage. Treatments containing pinoxaden provided the greatest Italian ryegrass control, regardless of tillage system. The use of pyroxasulfone PRE controlled a higher percentage of Italian ryegrass in the Piedmont when compared to the Coastal Plain, which is believed to be due to multiple flushes during the growing season in the Coastal Plain. Herbicide treatment was still a significant factor in Italian ryegrass control, but Italian ryegrass seed head density was consistently lower in the no-till system. Tillage may be stimulating germination, allowing greater control with PRE herbicides. An integrated system of herbicides and tillage may allow for greater yield and reduce selection pressure on POST herbicides.

Insect Distribution in a Spring Pea-Winter Wheat-Spring Barley Crop Rotation System

2000 ◽  
Vol 35 (3) ◽  
pp. 327-333 ◽  
Author(s):  
S. S. Quisenberry ◽  
D. J. Schotzko ◽  
P. F. Lamb ◽  
F. L. Young
Keyword(s):  
Winter Wheat ◽  
Weed Management ◽  
Conservation Tillage ◽  
Spring Barley ◽  
Triticum Aestivum L ◽  
Hordeum Vulgare L ◽  
Management Level ◽  
Insect Distribution ◽  
Tillage Method ◽  
Pea Leaf Weevil

The effects of tillage method (conventional or conservative) and weed management level (recommended or minimum) on insect distribution in a wheat (Triticum aestivum L.), barley (Hordeum vulgare L.), and pea (Pisum sativum L.) rotation were studied. Aphids were the major insect species on winter wheat and spring barley, but were not of economic importance. Beneficial species impacted aphid population levels by maintaining their numbers below economic thresholds. Tillage method and weed management level had limited impact on aphid and beneficial insect populations. Pea leaf weevil (Sitonia lineatus [L.]) and pea weevil (Bruchus pisorum [L.]) populations reached economic injury levels in 1992; two insecticide applications were needed. Pea leaf weevil populations did not reach economic levels in 1993; however, pea weevil populations reached an economic level at flowering stage and an insecticide was applied. Pea leaf weevil populations were higher in conventional tillage plots compared with conservation tillage plots. Early-season insecticide applications suppressed beneficial insects in the pea plots.

Quackgrass suppression through crop rotation in conservation tillage systems

1994 ◽  
Vol 74 (1) ◽  
pp. 193-197 ◽  
Author(s):  
H. A. Loeppky ◽  
D. A. Derksen
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Crop Rotation ◽  
Weed Management ◽  
Conservation Tillage ◽  
Triticum Aestivum L ◽  
Shoot Density ◽  
Integrated Weed Management ◽  
Node Density ◽  
Elytrigia Repens

Quackgrass [Elytrigia repens (L.) Nevski] is a widespread perennial weed traditionally controlled by tillage, a practice which can contribute to soil erosion and degradation. This study was initiated to determine the impact of integrated weed management strategies utilizing crop rotation, conservation tillage, and postemergence herbicides on quackgrass. Rotations of tall and semi-dwarf winter wheat (Triticum aestivum L. 'Norstar' and 'Norwin') or spring wheat (Triticum aestivum L. 'Katepwa' and 'HY320') with mustard (Brassica juncea 'Common Brown') and flax (Linum usitatissimum L. 'Norlin') were conducted at Indian Head, Saskatchewan for 4 yr to determine their effect on quackgrass shoot density, rhizome dry weight and rhizome node density. The presence or absence of winter wheat within the crop rotation had the greatest impact on quackgrass growth. During years when drought hampered winter wheat establishment, quackgrass growth was greater in winter wheat than in spring wheat, but under conditions favoring winter wheat establishment, the opposite occurred. Quackgrass growth in standard height wheat was similar to semi-dwarf wheat. Annual differences in quackgrass growth occurred between mustard and flax, but overall, no trend developed. Shoot density, rhizome biomass, and rhizome node density were not consistently correlated to crop yield. Crop rotation is a useful component of an integrated quackgrass management system. Key words: Integrated weed management (IWM), quackgrass, Elytrigia repens, crop rotation, conservation tillage

scholarly journals Weed management in no-till winter wheat (Triticum aestivum L.)

2010 ◽  
Vol 29 (1) ◽  
pp. 1-6 ◽  
Author(s):  
José M.G. Calado ◽  
Gottlieb Basch ◽  
Mário de Carvalho
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Weed Management ◽  
Triticum Aestivum L ◽  
No Till

scholarly journals Comparison of Herbicides for Control of Diclofop-Resistant Italian Ryegrass in Wheat

Agriculture ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 135 ◽  
Author(s):  
Taghi Bararpour ◽  
Ralph Hale ◽  
Gurpreet Kaur ◽  
Jason Bond ◽  
Nilda Burgos ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Lolium Perenne ◽  
Wheat Yield ◽  
Field Studies ◽  
Triticum Aestivum L ◽  
Italian Ryegrass ◽  
Lolium Perenne L

Diclofop-resistant Italian ryegrass (Lolium perenne L. ssp. Multiflorum (Lam.) Husnot) is a dominant weed problem in non-irrigated winter wheat (Triticum aestivum L.) in mid-south USA. Field studies were conducted from 2001 to 2007 to evaluate the efficacy of herbicides for diclofop-resistant ryegrass control and effect on wheat yield. In 2001 through 2004, chlorsulfuron/metsulfuron at 0.026 kg ha−1 preemergence (PRE) followed by (fb) mesosulfuron at 0.048 kg ha−1 at 4-leaf to 2-tiller ryegrass provided 89% control of diclofop-resistant Italian ryegrass, resulting in the highest wheat yield (3201 kg ha−1). Flufenacet/metribuzin at 0.476 kg ha−1 applied at 1- to 2-leaf wheat had equivalent Italian ryegrass control (87%), but lesser yield (3013 kg ha−1). In 2005–2006, best treatments for Italian ryegrass control were chlorsulfuron/metsulfuron, 0.013 kg ha−1 PRE fb mesosulfuron 0.015 kg ha−1 at 3- to 4-leaf ryegrass (92%); metribuzin, 0.280 kg ha−1 at 2- to 3- leaf wheat fb metribuzin at 2- to 3-tiller ryegrass (94%); chlorsulfuron/metsulfuron (0.026 kg ha−1) (89%); and flufenacet/metribuzin at 1- to 2-leaf wheat (89%). Chlorsulfuron/metsulfuron fb mesosulfuron provided higher yield (3515 kg ha−1) than all other treatments, except metribuzin fb metribuzin.

scholarly journals Appearance of Powdery Mildew of Wheat Caused by Blumeria graminis f. sp. tritici on Pm17-Bearing Cultivars in North Carolina

Plant Disease ◽  
2009 ◽  
Vol 93 (11) ◽  
pp. 1219-1219 ◽  
Author(s):  
C. Cowger ◽  
R. Parks ◽  
D. Marshall
Keyword(s):  
United States ◽  
North Carolina ◽  
South Carolina ◽  
Powdery Mildew ◽  
Winter Wheat ◽  
Triticum Aestivum L ◽  
Blumeria Graminis ◽  
Low Frequencies ◽  
Multiple Strains ◽  
Red Winter Wheat

Pm17 is a gene for resistance to powdery mildew caused by Blumeria graminis (DC.) E.O. Speer f. sp. tritici. The gene was first confirmed in the wheat-rye translocation cultivar Amigo (1). In Amigo, the translocation is T1AL-1RS and the 1RS arm has the gene Pm17. In the mid-Atlantic United States, at least two widely deployed soft red winter wheat (Triticum aestivum L.) cultivars, McCormick (2) and Tribute (3), possess Pm17 inherited from Amigo. Before 2009, low frequencies of mostly intermediate virulence to Pm17 were detected among isolates from research plots of highly susceptible cultivars (4), but Pm17-bearing cultivars remained immune to mildew in the field. In April 2009, moderately severe powdery mildew was observed for the first time throughout plots of McCormick, Tribute, and other cultivars in both Kinston and Raleigh, NC. At Kinston, Pm17 virulence was observed at two research sites, separated by approximately 10 km, throughout plots of Amigo, McCormick, Tribute, and the hard red winter wheat cultivar TAM 303, which also contains Pm17. In the same month, virulence to Pm17 was observed in Raleigh throughout rows and plots of Amigo and TAM 303. In Kinston and Raleigh, ratings of powdery mildew severity on the Pm17-containing cultivars were 4 or 5 on a scale of 0 to 9, with 0 being the absence of mildew pustules and 9 the most severe mildew infection. Mildew was observed on leaves of all ages. Mildewed leaves were collected from field plots of all four Pm17-bearing cultivars, and an assay to confirm Pm17 virulence was conducted in the laboratory. Mixed-isolate cultures were derived from the leaves and a detached-leaf assay was performed using Amigo, which is the standard Pm17 differential (4). All tested cultures were fully to moderately virulent on Pm17 and all were fully virulent on the susceptible control Chancellor. In the field, chasmothecia (sexual fruiting bodies) were observed on Pm17-bearing cultivars. Together with the quantitatively varying Pm17 virulence detected in the laboratory assay, this suggests that multiple strains of Pm17-virulent B. graminis f. sp. tritici may be present in the field, although that has not yet been demonstrated. Pm17 has protected wheat from powdery mildew over a substantial area in the mid-Atlantic United States. The loss of Pm17 is the most important virulence shift in the U.S. wheat powdery mildew population since Pm4a became ineffective around 2002. Isolates virulent to Pm17 can be expected to appear and multiply in wheat-producing states of the mid-Atlantic United States, including Delaware, Maryland, Virginia, North Carolina, South Carolina, and Georgia. Thus, the urgency of developing and releasing wheat cultivars with other sources of effective mildew resistance is heightened. References: (1) B. Friebe et al. Euphytica 91:59, 1996. (2) C. A. Griffey et al. Crop Sci. 45:416, 2005. (3) C. A. Griffey et al. Crop Sci. 45:419, 2005. (4) R. Parks et al. Plant Dis. 92:1074, 2008.

Susceptibility of Palmer amaranth (Amaranthus palmeri) to herbicides in accessions collected from the North Carolina Coastal Plain

Weed Science ◽  
2020 ◽  
Vol 68 (6) ◽  
pp. 582-593
Author(s):  
Denis J. Mahoney ◽  
David L. Jordan ◽  
Nilda Roma-Burgos ◽  
Katherine M. Jennings ◽  
Ramon G. Leon ◽  
...  
Keyword(s):  
North Carolina ◽  
Dose Response ◽  
Coastal Plain ◽  
Weed Management ◽  
Acetolactate Synthase ◽  
Fold Increase ◽  
Palmer Amaranth ◽  
Amaranthus Palmeri ◽  
Sites Of Action ◽  
Two Populations

AbstractPalmer amaranth (Amaranthus palmeri S. Watson) populations resistant to acetolactate synthase (ALS)-inhibiting herbicides and glyphosate are fairly common throughout the state of North Carolina (NC). This has led farm managers to rely more heavily on herbicides with other sites of action (SOA) for A. palmeri control, especially protoporphyrinogen oxidase and glutamine synthetase inhibitors. In the fall of 2016, seeds from A. palmeri populations were collected from the NC Coastal Plain, the state’s most prominent agricultural region. In separate experiments, plants with 2 to 4 leaves from the 110 populations were treated with field use rates of glyphosate, glufosinate-ammonium, fomesafen, mesotrione, or thifensulfuron-methyl. Percent visible control and survival were evaluated 3 wk after treatment. Survival frequencies were highest following glyphosate (99%) or thifensulfuron-methyl (96%) treatment. Known mutations conferring resistance to ALS inhibitors were found in populations surviving thifensulfuron-methyl application (Ala-122-Ser, Pro-197-Ser, Trp-574-Leu, and/or Ser-653-Asn), in addition to a new mutation (Ala-282-Asp) that requires further investigation. Forty-two populations had survivors after mesotrione application, with one population having 17% survival. Four populations survived fomesafen treatment, while none survived glufosinate. Dose–response studies showed an increase in fomesafen needed to kill 50% of two populations (LD50); however, these rates were far below the field use rate (less than 5 g ha−1). In two populations following mesotrione dose–response studies, a 2.4- to 3.3-fold increase was noted, with LD90 values approaching the field use rate (72.8 and 89.8 g ha−1). Screening of the progeny of individuals surviving mesotrione confirmed the presence of resistance alleles, as there were a higher number of survivors at the 1X rate compared with the parent population, confirming resistance to mesotrione. These data suggest A. palmeri resistant to chemistries other than glyphosate and thifensulfuron-methyl are present in NC, which highlights the need for weed management approaches to mitigate the evolution and spread of herbicide-resistant populations.

Wheat residue management options for no-till corn

1997 ◽  
Vol 77 (2) ◽  
pp. 207-213 ◽  
Author(s):  
G. Opoku ◽  
T. J. Vyn
Keyword(s):  
Soil Moisture ◽  
Winter Wheat ◽  
Grain Yield ◽  
Soil Surface ◽  
Triticum Aestivum L ◽  
Residue Management ◽  
Yield Reduction ◽  
Management Options ◽  
Grain Yields ◽  
No Till

Corn (Zea mays L.) yield reduction following winter wheat (Triticum aestivum L.) in no-till systems prompted a study on the effects of tillage and residue management systems on corn growth and seedbed conditions. Four methods for managing wheat residue (all residue removed, straw baled after harvest, straw left on the soil surface, straw left on the soil surface plus application of 50 kg ha−1N in the fall) were evaluated at two tillage levels: fall moldboard plow (MP) and no-till (NT). No-till treatments required at least 2 more days to achieve 50% corn emergence and 50% silking, and had the lowest corn biomass at 5 and 7 wk after planting. Grain yield was similar among MP treatments and averaged 1.1 t ha−1 higher than NT treatments (P < 0.05). Completely removing all wheat residue from NT plots reduced the number of days required to achieve 50% corn emergence and increased grain yields by 0.43 and 0.61 t ha–1 over baling and not baling straw, respectively, but still resulted in 8% lower grain yields than MP treatments. Grain yield differences among MP treatments were insignificant regardless of the amount of wheat residue left on the surface or N application in the fall. Early in the growing season, the NT treatments where residue was not removed had lower soil growing degree days (soil GDD) compared with MP (baled) treatment, and higher soil moisture levels in the top 15 cm compared with all other treatments. The application of 50 kg N ha−1 in the fall to NT (not baled) plots influenced neither the amount of wheat residue on the soil surface, nor the soil NO3-N levels at planting. Our results suggest that corn response in NT systems after wheat mostly depends on residue level. Key words: Winter wheat, straw management, no-till, corn, soil temperature, soil moisture

Weed response and crop growth in winter wheat–lucerne intercropping: a comparison of conventional and reduced soil-tillage conditions in northern France

2017 ◽  
Vol 68 (11) ◽  
pp. 1070 ◽  
Author(s):  
E. Barilli ◽  
M.-H. Jeuffroy ◽  
J. Gall ◽  
S. de Tourdonnet ◽  
S. Médiène
Keyword(s):  
Winter Wheat ◽  
Weed Control ◽  
Weed Management ◽  
Conservation Tillage ◽  
Group Analysis ◽  
Soil Tillage ◽  
Integrated Weed Management ◽  
Living Mulch ◽  
Wheat Production ◽  
Weed Communities

Changing agricultural practices from conventional to conservation tillage generally leads to increased weed populations and herbicide use. To gain information about the possible use of lucerne (Medicago sativa L.) cover crop as an alternative and sustainable weed-control strategy for winter wheat (Triticum aestivum L.), an experiment was performed at Thiverval-Grignon, France, from 2008 to 2010. We compared conventional and reduced tillage as well as the presence and absence of living mulch (i.e. lucerne) on weeds and wheat production. Percentage soil coverage and aboveground biomass of wheat, lucerne and weeds were measured at the end of grain filling. Weed communities were analysed in terms of composition and diversity. During both seasons, wheat biomass did not significantly decrease in reduced-till trials compared with conventional ones (7.0 and 7.2 t ha–1, respectively, in 2008–09; 6.9 and 7.1 t ha–1 in 2009–10). Regardless of soil management, the percentage soil coverage by wheat significantly decreased when it was intercropped, although wheat biomass was not significantly reduced compared with the sole crop. To minimise cash-crop losses, we studied the competition between wheat, lucerne and weeds, testing various herbicide strategies. Early control of lucerne allowed better balance between weed control and wheat development. In addition, weed communities varied among treatments in terms of abundance and composition, being reduced but more varied in plots associated with lucerne. A functional group analysis showed that grasses benefited from reduced-till conditions, whereas problematic weeds such as annuals with creeping and climbing morphologies were substantially reduced. In addition, annual and perennial broad-leaf species with rosette morphology were also significantly decreased when lucerne was used as living mulch. Wheat production in reduced-till conditions intercropped with lucerne living mulch may be useful for integrated weed management, reducing the need for herbicides.

Alternative weed management strategies in conservation tillage systems for white beans (Phaseolus vulgaris L.)

1998 ◽  
Vol 78 (2) ◽  
pp. 363-370 ◽  
Author(s):  
David C. Hooker ◽  
Tony J. Vyn ◽  
Clarence J. Swanton
Keyword(s):  
Phaseolus Vulgaris ◽  
Weed Management ◽  
Conservation Tillage ◽  
Management Strategies ◽  
First Year ◽  
Tillage Systems ◽  
No Till ◽  
White Bean ◽  
Chisel Plow ◽  
Moldboard Plow

White bean producers often perceive that increased herbicide inputs are required with the adoption of conservation tillage. Acceptance of conservation tillage systems for this crop would increase if effective weed management practices were assured. In 1991 and 1992, various weed management strategies were evaluated in white bean (Phaseolus vulgaris L.) grown with three tillage systems at two sites in southern Ontario. Experiments were newly established each year following corn harvested for grain. Primary tillage treatments were fall moldboard plowing, fall chisel plowing, and first-year no-till. Combinations of mechanical weeding, metobromuron [3–(4–bromophenyl)–1–methoxy–1–methylurea] herbicide broadcasted at two rates, and a band application of the herbicide were investigated in each tillage system. Timely rotary hoeing reduced weed numbers in moldboard plow and chisel plow treatments, but was not effective in no-till. Weeds were adequately controlled in all tillage systems with mechanical treatments following a herbicide either broadcasted at a reduced rate or banded over the crop row. Metobromuron broadcasted at the full recommended rate alone controlled weeds in no-till; in contrast, the degree of weed control was poor without mechanical cultivation in both moldboard and chisel plow systems. Integrating mechanical and chemical control methods was more beneficial in tilled systems. Overall weed populations were lower in first-year no-till than moldboard plow or chisel plow tillage systems. White bean producers who adopt conservation tillage under conditions similar to those investigated can be assured of effective weed management alternatives as well as bean yields equivalent to conventional tillage. Key words: Conservation tillage, weed management, rotary hoe, inter-row cultivation, Phaseolus vulgaris

scholarly journals INTEGRATED POTATO PROTECTION SYSTEM FROM GOLDEN POTATO CYST NEMATODES

2019 ◽  
pp. 51-56
Author(s):  
Babich ◽  
Babich
Keyword(s):  
Winter Wheat ◽  
Cyst Nematode ◽  
Potato Cyst Nematode ◽  
Integrated System ◽  
Effective Control ◽  
Optimal Time ◽  
Cyst Nematodes ◽  
Protective Measures ◽  
Level Of Invasion ◽  
Clover Seed

An integrated system for protecting potatoes from a golden potato cyst nematode has been developed, adapted for use in agricultural farms of various forms of ownership and includes a number of protective measures: the imposition of quarantine, a differentiated choice of unaffected crops (in collective and farm enterprises: lupine, winter wheat, sugar beet, Vico – oats , corn, barley with clover seed, clover, winter wheat, fodder beet; peas, winter wheat, corn. in individual farms: strawberries, green cultures, table beets, resistant varieties of potatoes, carrots, cabbage, cucumbers, peas, onions, garlic, cabbage. To reduce the level of invasion by the larvae of the initial phases of growth and development of plants to a golden potato cyst nematode, the treatment of tubers with a Kruiser 350 FS bp is recommended. – 0.3 l / t, as well as preparations based on metabolites of soil streptomycetes (Averkom, Averstim), as well as planting tubers in an early-optimal time in order to obtain seedlings of potatoes before the mass release of larvae from cysts. Local selective harvesting of susceptible varieties in the budding-flowering phase of potatoes and destruction of sprouts of unwanted vegetation by manual and mechanical means of tillage are aimed at interrupting the cycle of development of a golden potato cyst nematode and reducing the level of soil population. compliance with environmentally safe and affordable protective measures ensures effective control of the golden potato cyst nematode and the prevention of significant losses of potato yield. The developed protective measures do not require significant investments and are acceptable for implementation in farms of various forms of ownership.

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