THE RESPONSE OF SOME KENTUCKY BLUEGRASS CULTIVARS TO COMPETITIVE STRESS FROM ANNUAL BLUEGRASS

1979 ◽  
Vol 59 (4) ◽  
pp. 1123-1128
Author(s):  
J. L. EGGENS
Keyword(s):  
Competitive Ability ◽  
Poa Pratensis ◽  
Kentucky Bluegrass ◽  
Poa Annua ◽  
Growth Chamber ◽  
Annual Bluegrass ◽  
Short Day

The ability of seven Kentucky bluegrass (Poa pratensis L.) cultivars to compete against annual bluegrass (Poa annua L.) under greenhouse and growth chamber conditions was evaluated. Under natural long days from June to November in the greenhouse and under a 15-h daylength in the growth chamber, annual bluegrass produced significantly more tillers than each of the Kentucky bluegrass cultivars. Under short day condition (10 h) in the growth chamber, the number of innovations produced by Sydsport Kentucky bluegrass was not significantly different from annual bluegrass. Under natural daylength of February and March in the greenhouse, the number of innovations produced by Baron, Glade and Sydsport Kentucky bluegrass cultivars was not significantly different from that produced by annual bluegrass. A method to evaluate the competitive ability of Kentucky bluegrass under daily 2-cm mowing height is described.

INFLUENCE OF MOWING ON LEAF AND TILLER ORIENTATION OF TURFGRASSES

1982 ◽  
Vol 62 (4) ◽  
pp. 979-982 ◽  
Author(s):  
J. L. EGGENS
Keyword(s):  
Competitive Ability ◽  
Growth Habit ◽  
Poa Pratensis ◽  
Kentucky Bluegrass ◽  
Leaf Angle ◽  
Annual Bluegrass ◽  
Morphological Adaptations ◽  
Athletic Fields ◽  
Grass Weed ◽  
Prostrate Growth

Annual bluegrass (Poa annua L.) is a major grass weed on athletic fields. Since mowing modifies interspecies competitive ability, a program was initiated to determine if any morphological adaptations to mowing occur which might enable Kentucky bluegrass (Poa pratensis L.) to compete more successfully with annual bluegrass. Changes in leaf and tiller orientation of 11 Kentucky bluegrass cultivars and annual bluegrass in response to mowing or not mowing were measured. The mowing treatment consisted of clipping the grasses at 2, 3, 4 or 5 cm. For the 12 grasses there was a significant increase in leaf angle at the 2- and 3-cm mowing height. The increase was not consistent for all grasses and mowing treatments. Leaf angle was not related to the ability of the cultivars to compete with annual bluegrass. The grasses became more prostrate when mowed. While Kentucky bluegrass cultivars with the most prostrate growth habit have been shown to be more competitive with annual bluegrass, growth habit does not appear to be sufficiently important to be the main criterion for choosing Kentucky bluegrass cultivars for use in regularly irrigated, close clipped athletic fields.

scholarly journals Postemergence Control of Annual Bluegrass with Mesotrione in Kentucky Bluegrass

HortScience ◽  
2012 ◽  
Vol 47 (4) ◽  
pp. 522-526 ◽  
Author(s):  
Joshua J. Skelton ◽  
William Sharp ◽  
Bruce E. Branham
Keyword(s):  
Environmental Conditions ◽  
Poa Pratensis ◽  
Kentucky Bluegrass ◽  
Field Trials ◽  
Poa Annua ◽  
Annual Bluegrass ◽  
Air Temperatures ◽  
Significant Application ◽  
Levels Of Control

Six field trials were conducted in 2009 and 2010 to study postemergence control of annual bluegrass (Poa annua L. var. Hausskn Timm) in kentucky bluegrass (Poa pratensis L.) with mesotrione. Mesotrione was applied at 11 different rate and application intervals to an area of kentucky bluegrass that was naturally infested with annual bluegrass. Mesotrione rates of 56 g·ha−1 applied two or three times per week for a total of 10 applications or 84 g·ha−1 applied two times per week for a total of seven applications provided consistent control of annual bluegrass but required significant application labor and resulted in minor kentucky bluegrass injury. Other treatments that required fewer applications, 110 g·ha−1 applied twice per week for five applications or 186 g·ha−1 per week for three applications, also achieved high levels of control under high air temperatures, but control levels can vary significantly as temperatures fluctuate and seasons change. Mesotrione can successfully control annual bluegrass in kentucky bluegrass when frequent applications at low rates are applied or when environmental conditions are conducive to control.

scholarly journals Response of Kentucky Bluegrass (Poa pratensis L.) Cultivars and Selections to Bispyribac-sodium Herbicide

HortScience ◽  
2008 ◽  
Vol 43 (7) ◽  
pp. 2252-2255 ◽  
Author(s):  
Robert R. Shortell ◽  
Stephen E. Hart ◽  
Stacy A. Bonos
Keyword(s):  
New Jersey ◽  
Initial Treatment ◽  
Field Experiments ◽  
Poa Pratensis ◽  
Intraspecific Variability ◽  
Kentucky Bluegrass ◽  
Poa Annua ◽  
Cool Season ◽  
Annual Bluegrass

Annual bluegrass (Poa annua L.) is a problematic weed in Kentucky bluegrass (Poa pratensis L.). Bispyribac-sodium herbicide can effectively control established annual bluegrass in other cool-season turfgrasses, but unacceptable injury to Kentucky bluegrass has been reported. However, only a few Kentucky bluegrass cultivars have been evaluated. The objective of this study was to determine the extent of intraspecific variability among Kentucky bluegrass cultivars and selections to sequential applications of bispyribac-sodium herbicide. Field experiments were conducted in 2004 and 2005 in New Jersey to determine the response of 55 Kentucky bluegrass cultivars and selections to bispyribac-sodium. The herbicide was applied at 188 g·ha−1 followed 3 weeks later by a second application of 281 g·ha−1. Kentucky bluegrass injury ranged from 8% to 93% 8 weeks after initial treatment (WAIT). ‘Blackstone’, ‘Serene’, and A98-962 were the most tolerant to bispyribac-sodium, exhibiting less than 20% injury 8 WAIT. Conversely, ‘Washington’, 95AN-10, and ‘Avalanche’ were the most susceptible with up to 93% injury 8 WAIT. The range in tolerance to bispyribac-sodium within Kentucky bluegrass indicates the potential for the identification and development of cultivars with improved tolerance to bispyribac-sodium herbicide.

Selectivity of Endothall in Turf

Weed Science ◽  
1972 ◽  
Vol 20 (6) ◽  
pp. 557-561 ◽  
Author(s):  
A. J. Turgeon ◽  
Donald Penner ◽  
W. F. Meggitt
Keyword(s):  
Dicarboxylic Acid ◽  
Poa Pratensis ◽  
Creeping Bentgrass ◽  
Kentucky Bluegrass ◽  
Agrostis Stolonifera ◽  
Poa Annua ◽  
Selective Action ◽  
Annual Bluegrass ◽  
Morphological Differences

Absorption, translocation, metabolism, and action of 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acid (endothall) in annual bluegrass (Poa annua L.), Kentucky bluegrass (Poa pratensis L. ‘Merion’), and creeping bentgrass (Agrostis stolonifera L. ‘Penncross’) were studied. Selective action on annual bluegrass from root applications of endothall was attributed to differences in absorption and action of the herbicide. Morphological differences among species, spray retention, and endothall action contributed to selectivity following foliar applications.

scholarly journals Mesotrione and Amicarbazone Tank-mixtures for Annual Bluegrass (Poa annua) Control in Cool-season Turfgrass

HortScience ◽  
2022 ◽  
Vol 57 (1) ◽  
pp. 10-16
Author(s):  
Matthew T. Elmore ◽  
Aaron J. Patton ◽  
Adam W. Thoms ◽  
Daniel P. Tuck
Keyword(s):  
New Jersey ◽  
Festuca Arundinacea ◽  
Field Experiments ◽  
Poa Pratensis ◽  
Kentucky Bluegrass ◽  
Poa Annua ◽  
Cool Season ◽  
Poor Control ◽  
Annual Bluegrass ◽  
Postemergence Herbicides

Annual bluegrass (Poa annua L.) control with postemergence herbicides in cool-season turfgrass is often inconsistent. Amicarbazone and mesotrione have complementary modes of action but have not been evaluated in tank-mixtures for control of mature annual bluegrass in cool-season turfgrass. Field experiments were conducted during 2018 in New Jersey, and in Indiana, Iowa, and New Jersey during 2019 to evaluate springtime applications of amicarbazone and mesotrione for POST annual bluegrass control in cool-season turfgrass. On separate tall fescue (Festuca arundinacea Schreb.) and kentucky bluegrass (Poa pratensis L.) sites in 2018, three sequential applications of amicarbazone (53 g⋅ha−1) + mesotrione at 110 to 175 g⋅ha−1 provided >70% annual bluegrass control, whereas three sequential applications of amicarbazone alone at 53 and 70 as well as two sequential applications at 110 g⋅ha−1 provided <15% control at 14 weeks after initial treatment (WAIT). In 2019, results in New Jersey were similar to 2018 where amicarbazone alone provided less control than mesotrione + amicarbazone tank-mixtures. In Indiana, where the annual bluegrass infestation was severe and most mature, tank-mixtures were more effective than amicarbazone alone at 6 WAIT, but at 12 WAIT all treatments provided poor control. In Iowa, where the annual bluegrass infestation was <1 year old, all treatments provided similar control throughout the experiment and by >80% at the conclusion of the experiment. This research demonstrates that sequential applications of mesotrione + amicarbazone can provide more annual bluegrass control than either herbicide alone, but efficacy is inconsistent across locations, possibly due to annual bluegrass maturity and infestation severity.

SELECTIVE CONTROL OF ANNUAL BLUEGRASS IN KENTUCKY BLUEGRASS TURF WITH LINURON

1979 ◽  
Vol 59 (2) ◽  
pp. 469-473 ◽  
Author(s):  
R. G. INGRATTA ◽  
G. R. STEPHENSON ◽  
C. M. SWITZER
Keyword(s):  
Temperature Regime ◽  
Poa Pratensis ◽  
Kentucky Bluegrass ◽  
Controlled Environment ◽  
Night Temperature ◽  
Annual Bluegrass ◽  
Selective Control ◽  
Excellent Control

Optimum top growth of annual bluegrass (Pao annua L.) and Kentucky bluegrass (Poa pratensis L.) was obtained at 24/12 °C day/night temperature regime in controlled environment studies. The tolerance of seedling Kentucky bluegrass to linuron [3-(3,4-dichlorophenyl)-1)methylurea] appeared to be greatest at this temperature regime when photoperiods were 16 h in length. A granular formulation of linuron gave excellent control of annual bluegrass in Kentucky bluegrass turf at 6.7 kg/ha when applied postemergence. At this rate, all culitivars of Kentucky bluegrass tested, with the exception of Fylking, were tolerant to linuron as a granular formulation. After application of linuron at 3.4–6.7 kg/ha, phytotoxic residues remained in the soil at sufficient levels to injure seedling Kentucky bluegrass for up to 3 mo.

Control of Annual Bluegrass (Poa annua) in Kentucky Bluegrass (Poa pratensis) Turf with Linuron

1992 ◽  
Vol 6 (4) ◽  
pp. 852-857 ◽  
Author(s):  
J. Christopher Hall ◽  
C. Ken Carey
Keyword(s):  
Field Experiments ◽  
Poa Pratensis ◽  
Stand Density ◽  
Normal Growth ◽  
Dry Weight ◽  
Kentucky Bluegrass ◽  
Controlled Environment ◽  
Annual Bluegrass ◽  
Turf Quality ◽  
Severe Reduction

Effects of linuron on annual bluegrass control and Kentucky bluegrass cultivar tolerance were studied in field and growth chamber experiments. In controlled environment experiments, linuron at 0.06, 0.12, 0.25, 0.50, and 0.75 kg ai ha-1 was applied to pure stands of annual bluegrass and eight Kentucky bluegrass cultivars. Linuron at the two highest rates controlled annual bluegrass, reducing the clipping dry weight by more than 85% 4 wk after treatment, and by 65 to 92% 6 wk after treatment. Growth of Kentucky bluegrass was reduced with the most severe reduction occurring 2 wk after linuron application. All cultivars exhibited normal growth 8 wk after treatment. In field experiments, linuron at rates from 1.5 to 2.0 kg ai ha-1 controlled annual bluegrass in old (> 5 yr) Kentucky bluegrass stands, and in 16 cultivars of 1-yr and 2-yr-old Kentucky bluegrass stands, with little or no damage. At rates of 1.5, 2.0, and 2.5 kg ai ha-1 linuron, damage to newly seeded cultivars was moderate to severe. However, 6 to 7 wk after linuron application to newly seeded cultivars, stand density and turf quality were equivalent to untreated checks.

scholarly journals Use of Prodiamine as a Preemergence Herbicide to Control Annual Bluegrass in Kentucky Bluegrass

1999 ◽  
Vol 9 (1) ◽  
pp. 131c-132
Author(s):  
Peter H. Dernoeden
Keyword(s):  
Poa Pratensis ◽  
Kentucky Bluegrass ◽  
Golf Course ◽  
Golf Courses ◽  
Atlantic Region ◽  
Control Data ◽  
Annual Bluegrass ◽  
Germination Period ◽  
Mature Stand ◽  
Preemergence Herbicides

Annual bluegrass (Poa annua L.) is an intractable weed problem on golf courses. Much has been written about annual bluegrass, but there is little documentation of regional germination period(s) and the proper timing of preemergence herbicides targeted for the control of the annual biotype (P. annua ssp. annua [L.] Timm. = AB). The objectives of this field study were to determine the optimum prodiamine rate and timing for effective AB control. The turf was a mature stand of `Kenblue' Kentucky bluegrass (Poa pratensis L.) maintained under conditions similar to those imposed for golf course roughs. Three rates of prodiamine (0.36, 0.73, and 1.1 kg·ha-1) were applied on three dates in 1995 (11 Aug., 14 Sept., and 13 Oct.) and 1996 (29 Aug., 16 and 30 Sept.). All rates applied 11 Aug. or 14 Sept. 1995, and 29 Aug. or 16 Sept. 1996 effectively controlled AB. None of the rates applied 13 Oct. 1995 reduced AB cover, and the 0.36 kg·ha-1 rate applied 30 Sept. 1996 provided relatively poor AB control. Data and observations indicated that the major germination period for AB was between late September and early December. Effective AB control was achieved whenever prodiamine, regardless of rate, was applied between mid-August and mid-September. These prodiamine rates and this application window may be effective only in relatively high cut turf (i.e., >5.0 cm) in the mid-Atlantic region. Chemical names used: O,O-bis(1-methylethyl) S-{2-[(phenylsulfonyl)amino]ethyl} phosphorodithioate (bensulide); N3,N3-di-n-propyl-2,4-dinitro-6-(trifluoromethyl)-m-phenylenediamine (prodiamine).

scholarly journals Cool-season Turfgrass Response to Bispyribac-Sodium

HortScience ◽  
2005 ◽  
Vol 40 (5) ◽  
pp. 1552-1555 ◽  
Author(s):  
Darren W. Lycan ◽  
Stephen E. Hart
Keyword(s):  
Perennial Ryegrass ◽  
Tall Fescue ◽  
Field Experiments ◽  
Poa Pratensis ◽  
Creeping Bentgrass ◽  
Kentucky Bluegrass ◽  
Cool Season ◽  
Severe Stunting ◽  
Annual Bluegrass ◽  
Fine Fescue

Previous research has demonstrated that bispyribac-sodium can selectively control established annual bluegrass (Poa annua L.) in creeping bentgrass (Agrostis stolonifera L.). Annual bluegrass is also a problematic weed in other cool-season turfgrass species. However, the relative tolerance of other cool-season turfgrass species to bispyribac is not known. Field experiments were conducted at Adelphia, N.J., in 2002 and 2003 to gain understanding of the phytotoxic effects that bispyribac may have on kentucky bluegrass (Poa pratensis L.), perennial ryegrass (Lolium perenne L.), tall fescue (Festuca arundinacea (L.) Schreb.), and chewings fine fescue (Festuca rubra L. subsp. commutata Gaud.). Single applications of bispyribac at 37 to 296 g·ha–1 were applied to mature stands of each species on 11 June, 2002 and 10 June, 2003. Visual injury was evaluated and clippings were collected 35 and 70 days after treatment (DAT). Visual injury at 35 DAT increased as bispyribac rate increased. Kentucky bluegrass was least tolerant to bispyribac with up to 28% injury when applied at 296 g·ha–1. Injury on other species did not exceed 20%. Initial injury on perennial ryegrass, tall fescue, and chewings fine fescue was primarily in the form of chlorosis, while kentucky bluegrass exhibited more severe stunting and thinning symptoms. Bispyribac at rates from 74 to 296 g·ha–1 reduced kentucky bluegrass clipping weights by 19% to 35%, respectively, as compared to the untreated control at 35 DAT in 2002. Initial visual injury on perennial ryegrass, tall fescue, and chewings fine fescue dissipated to ≤5% by 70 DAT. However, recovery of kentucky bluegrass was less complete. These studies suggest that bispyribac-sodium has potential to severely injure kentucky bluegrass. Injury on perennial ryegrass, tall fescue, and chewings fine fescue appears to be less severe and persistent; therefore, bispyribac can be used for weed control in these species. Chemical names used: 2,6-bis[(4,6-dimethoxy-2-pyrimidinyl)oxy]benzoic acid (bispyribac-sodium).

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