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Christian M. Baldwin, A. Douglas Brede, and Jami J. Mayer

With the emergence of glyphosate-tolerant cultivars, identifying management strategies not applicable with older cultivars need to be revisited. Objectives of these research trials were to quantify the growth regulation effects following a glyphosate application and to determine the safety of tank mixing glyphosate with another herbicide, various nitrogen (N) sources, and a plant growth regulator (PGR) on a glyphosate-tolerant perennial ryegrass [PRG (Lolium perenne L.)] cultivar, Replay. In the growth regulation trial, glyphosate was applied at 0 to 1.03 lb/acre, whereas PGRs flurpimidol, trinexapac-ethyl, paclobutrazol, and trinexapac-ethyl + flurpimidol were applied at 0.50, 0.18, 0.37, and 0.09 + 0.22 lb/acre, respectively, on 15 July 2010 and 2 Aug. 2012. In the tank mixing trial, dicamba (0.50 lb/acre), urea (15 lb/acre N), and ammonium sulfate [AMS (15 lb/acre N)] were applied alone or tank mixed with glyphosate at 0 to 0.52 lb/acre. Tank mixing urea with glyphosate had minimal effect on PRG color, while adding AMS consistently improved color at the highest glyphosate rate of 0.52 lb/acre. Twenty days following a glyphosate application, only rates >0.40 lb/acre resulted in significant growth regulation compared with untreated plots. This study indicates that tank mixing glyphosate with another herbicide, a PGR, and various N sources appear safe to the glyphosate-tolerant PRG cultivar. Also, the growth regulating effects of glyphosate applications would serve as an additional benefit to annual bluegrass (Poa annua L.) control reported in previous trials.

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S. J. Wallner, M. R. Becwar, and J. D. Butler

Abstract

Injury to turfgrass leaf segments was measured as percent electrolyte leakage as affected by the duration and level of imposed heat stress. Species differences in heat tolerance were most apparent when injury was monitored over time at 50°C, using leaf segments which were obtained from heat-hardened plants and immersed in distilled water during the stress treatment. Quantitative differences in heat tolerance in vitro were consistent with qualitative descriptions of drought resistance for most of the species tested.

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Kurt Steinke, David R. Chalmers, Richard H. White, Charles H. Fontanier, James C. Thomas, and Benjamin G. Wherley

rain shelter returned to its center position. Grasses evaluated in this parent study included eight cultivars of bermudagrass ( Cynodon dactylon sp.) (‘Celebration’, ‘Common’, ‘GN-1’, ‘Grimes EXP’, ‘Premier’, ‘TexTurf’, ‘TifSport’, and ‘Tifway’); seven

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Reagan W. Hejl, Benjamin G. Wherley, and Charles H. Fontanier

use in the study: ‘Riley’s Super Sport’ (Celebration ® ) bermudagrass [ Cynodon dactylon (L.) Pers.], ‘Palisades’ zoysiagrass ( Zoysia japonica Steud.), ‘Floratam’ st. augustinegrass [ Stenotaphrum secundatum (Walt.) Kuntze], and ‘SeaStar’ seashore

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Daniel Hargey, Benjamin Wherley, Casey Reynolds, Richard White, and Garrett Parker

Winter overseeding of dormant bermudagrass ( Cynodon dactylon sp.) athletic turf has been a common practice in the transition zone and southern United States. Winter overseeding provides an actively growing cool-season turfgrass stand that provides

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Bakir A. Al-Juboory

This experiment was conducted to determine effects of herbicides on the control of noxious perennial grass weeds. The results indicate that the rate, timing, duration and number of applications employed were the major factors in the successful control of perennial grass weeds such as Cogon Grass (Imperala cylindrica), Johnson Grass (Sorghum halepense), Bermuda Grass (Cynodon dactylon), Nut Grass (Cyperus rotundus) and Common Red (Phragmites spp.), commonly found in Iraq growing both in cultivated fields and wild on uncultivated land.

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M.L. Elliott and M. Prevatte

Eco, Milorganite, Ringer, and Sustane natural organic fertilizers, alone or combined with the synthetic organic fertilizer isobutylidene diurea (IBDU), were compared with IBDU alone for their effect on a `Tifdwarf' hybrid bermudagrass [Cynodon dactylon (L.) Pers. × C. transvaalensis Burtt-Davy] golf course putting green. Over the 2-year study period, no consistent differences were observed among the fertilizer treatments on the turfgrass growth parameters of quality, clipping weights, or root weights.

Open access

A. C. Tarjan and P. Busey

Abstract

Eight bermudagrass [Cynodon dactylon (L.) Pers. and related species] clonal selections were inoculated with a mixed sample of ectoparasitic nematodes and were grown for 5 months in 13-cm pots. Relative to control (noninoculated) pots, nematodes reduced root dry weight 13% (P < 0.01) but had no effect on overall shoot (clippings) yield. Commercially available cultivars ‘Tifgreen’ and ‘Tifdwarf’ had significantly greater root weight reductions and also supported significantly higher densities of the lance nematode, Hoplolaimus galeatus, than most other clones.

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K.L. Hays, J.F. Barber, M.P. Kenna, and T.G. McCollum

This study was conducted to determine rooting characteristics, root carbohydrate content, and performance of 10 bermudagrass [Cynodon dactylon (L.) Pers.] genotypes exposed to drought. A greenhouse study was conducted twice to determine root distribution and carbohydrate content throughout the soil profile during simulated drought stress. Root distribution among genotypes and accumulation of total nonstructural carbohydrate within roots differed with depths. Root mass at 30, 60, 90, and 150 cm was significantly correlated with turf quality during drought stress (r = 0.72, 0.86, 0.80, and 0.81, respectively) only for one of the two tests. Root carbohydrate distribution was not significantly correlated with turf quality for the selected bermudagrass genotypes.

Open access

Jeffrey A. Anderson, Michael P. Kenna, and Charles M. Taliaferro

Abstract

Electrolyte leakage and regrowth tests were used to estimate cold hardiness levels of field-grown ‘Midiron’ and ‘Tifgreen’ bermudagrass (Cynodon dactylon × C. transvaalensis crowns. The two procedures were in close agreement. ‘Midiron’ was hardier than ‘Tifgreen’ on all sampling dates. Greatest levels of freeze tolerance were –11°C for ‘Midiron’ and –7° for Tifgreen’ during December and January, ‘Midiron’ was killed at –5° in early June while ‘Tifgreen’ had lost all freeze tolerance by this date. Although the electrolyte leakage procedure was rapid and required no greenhouse space, it was relatively difficult to set up and evaluate.