Flazasulfuron Tank Mixtures with Amicarbazone for Annual Bluegrass Control in Seashore Paspalum

2014 ◽  
Vol 11 (1) ◽  
pp. ATS-2013-0086-RS ◽  
Author(s):  
Christopher R. Johnston ◽  
Patrick E. McCullough
Keyword(s):  
Seashore Paspalum ◽  
Annual Bluegrass

Seashore Paspalum Tolerance to Amicarbazone at Various Seasonal Application Timings

2015 ◽  
Vol 29 (1) ◽  
pp. 42-47 ◽  
Author(s):  
Jialin Yu ◽  
Patrick E. McCullough ◽  
Mark A. Czarnota
Keyword(s):  
Photosystem Ii ◽  
Shoot Growth ◽  
Field Experiments ◽  
Poor Control ◽  
Active Growth ◽  
Seashore Paspalum ◽  
Ps Ii ◽  
Application Timing ◽  
Annual Bluegrass ◽  
Potential Safety

Turfgrass injury from triazines has limited the use of photosystem II (PS II) inhibitors for weed control in seashore paspalum. Amicarbazone is a new PS II inhibitor with potential safety in seashore paspalum, but the effects of application timing on turf tolerance has received limited investigation. Field experiments were conducted in Griffin, GA to evaluate the tolerance of ‘Sea Isle 1’ seashore paspalum to amicarbazone applications in winter, spring, and summer. Seashore paspalum had minimal injury (< 5%) from amicarbazone treatments (98, 196, and 392 g ai ha−1) applied for annual bluegrass control in winter and spring. By 6 wk after treatment (WAT), amicarbazone at 392 g ha−1provided 78 and 90% annual bluegrass control in 2013 and 2014, respectively, and was similar to pronamide at 1,680 g ai ha−1. Amicarbazone at 196 g ha−1provided 71% control of annual bluegrass in 2014, but control was poor (< 70%) in 2013. Sequential amicarbazone applications at 98 g ha−1provided poor control in both years by 6 WAT. From six amicarbazone rates (up to 984 g ha−1) applied in summer, seashore paspalum required 510 and < 123 g ha−1for 20% turfgrass injury (I20) and 20% clipping reduction (CR20), respectively, whereas I20and CR20measured > 984 g ha−1for ‘Tifway’ bermudagrass. Overall, amicarbazone may be safely applied to seashore paspalum in winter, spring, and summer at rates and regimens evaluated. However, seashore paspalum may exhibit shoot growth inhibition up to 4 WAT, suggesting that end users should be cautious when using amicarbazone during active growth in summer.

Seashore Paspalum (Paspalum vaginatum) Tolerance to Pronamide Applications for Annual Bluegrass Control

2012 ◽  
Vol 26 (2) ◽  
pp. 289-293 ◽  
Author(s):  
Patrick E. McCullough ◽  
Jialin Yu ◽  
Diego Gomez de Barreda
Keyword(s):  
Field Experiments ◽  
Seashore Paspalum ◽  
Annual Bluegrass ◽  
Greenhouse Experiments ◽  
Paspalum Vaginatum ◽  
Turf Management

Annual bluegrass is a troublesome weed in turf management and there are currently limited POST herbicides labeled for use in seashore paspalum. Field and greenhouse experiments were conducted to evaluate seashore paspalum tolerance to pronamide and other herbicides for annual bluegrass control. In field experiments, turf injury never exceeded 7% from pronamide applied at dormancy, 50% green-up, or complete green-up of seashore paspalum in spring. Annual bluegrass control from pronamide was initially similar across timings and averaged 67, 90, and 98% control from 0.84, 1.68, and 3.36 kg ai ha−1, respectively, after 6 wk. In greenhouse experiments, the aforementioned pronamide rates caused less than 10% injury on seashore paspalum. Seashore paspalum injury in the greenhouse was excessive (> 20%) from atrazine, bispyribac-sodium, and trifloxysulfuron and moderate (7 to 20%) from foramsulfuron, rimsulfuron, and ethofumesate. Seashore paspalum seedhead count reductions by 4 wk after treatment (WAT) were good to excellent (87 to 98%) from atrazine, bispyribac-sodium, rimsulfuron, and trifloxysulfuron and poor (≤ 0%) from ethofumesate, foramsulfuron, and pronamide. By 4 WAT, seashore paspalum clippings were reduced 0 to 39% from pronamide, whereas atrazine, bispyribac-sodium, and trifloxysulfuron reduced clippings by 54 to 69% from the untreated and ethofumesate, foramsulfuron, and rimsulfuron reduced clippings by 27 to 39%.

Tolerance of Five Warm-Season Turfgrass Species to Flumioxazin

2014 ◽  
Vol 28 (2) ◽  
pp. 340-350 ◽  
Author(s):  
Thomas V. Reed ◽  
Patrick E. McCullough
Keyword(s):  
Weed Control ◽  
Warm Season ◽  
Late Winter ◽  
Active Growth ◽  
Seashore Paspalum ◽  
Annual Bluegrass ◽  
Initial Injury ◽  
Annual Weeds

Flumioxazin provides PRE and POST, annual weed control in dormant bermudagrass, but applications during active growth may be injurious. Flumioxazin could also provide an alternative chemistry for POST annual bluegrass control in other turfgrasses, but research is limited on tolerance levels. The objective of this research was to evaluate tolerance of five warm-season turfgrasses to flumioxazin applied at various rates and timings. Late-winter applications of flumioxazin at 0.21, 0.42, or 0.84 kg ai ha−1caused acceptable (< 20%) injury to bermudagrass, seashore paspalum, St. Augustinegrass, and zoysiagrass at 3, 6, and 9 wk after treatment (WAT) in both years. In 2012, late-winter applications to centipedegrass caused unacceptable injury at 6 WAT, but turf recovered to acceptable levels by 9 WAT at all rates. Applications made during active turfgrass growth caused unacceptable initial injury to all species. However, bermudagrass, seashore paspalum, St. Augustinegrass, and zoysiagrass recovered to < 20% injury by 9 WAT from all rates. In 2012, centipedegrass treated in midspring had 0, 24, and 74% injury from flumioxazin at 0.21, 0.42, and 0.84 kg ha−1, respectively, at 9 WAT. In 2013, midspring applications to centipedegrass caused 13, 48, and 71% injury from 0.21, 0.42, and 0.84 kg ha−1, respectively at 9 WAT. Overall, flumioxazin has the potential to control annual weeds in bermudagrass, seashore paspalum, St. Augustinegrass, and zoysiagrass with late-winter applications before greenup, but all turfgrasses may be excessively injured during active growth.

EFFECT OF SOME NATURAL ACTIVATORS ON GROWTH AND QUALITY OF SEASHORE PASPALUM TURF

2015 ◽  
Vol 2 (1) ◽  
pp. 149-156
Author(s):  
Boshra El-Sayed ◽  
Tarek Noor El-Deen ◽  
Magda Ahmed ◽  
Sayed Shahin
Keyword(s):  
Seashore Paspalum

scholarly journals Irrigation frequencies and reference evapotranspiration replacement affecting annual bluegrass encroachment in perennial ryegrass in Western Oregon

itsrj ◽  
2021 ◽  
Author(s):  
Alyssa Cain ◽  
Emily Braithwaite ◽  
Brian McDonald ◽  
Alec Kowalewski ◽  
Matthew Elmore
Keyword(s):  
Perennial Ryegrass ◽  
Reference Evapotranspiration ◽  
Annual Bluegrass

Response of seashore paspalum and bermudagrass to topramezone and triclopyr mixtures

2020 ◽  
pp. 1-8
Author(s):  
Clebson G. Gonçalves ◽  
Austin M. Brown ◽  
Suma Basak ◽  
J. Scott McElroy
Keyword(s):  
Field Conditions ◽  
Single Application ◽  
Seashore Paspalum ◽  
Application Timing ◽  
Application Programs ◽  
Over Time

Abstract Few options are available for controlling bermudagrass invasion of seashore paspalum. Bermudagrass and seashore paspalum tolerance to topramezone, triclopyr, or the combination of these two herbicides were evaluated in both greenhouse and field conditions. Field treatments included two sequential applications of topramezone (15.6 g ai ha−1) alone and five rates of topramezone + triclopyr (15.6 + 43.2, 15.6 + 86.3, 15.6 + 172.6, 15.6 + 345.2, or 15.6 g ai ha−1 + 690.4 g ae ha−1). Secondary greenhouse treatments included a single application of topramezone (20.8 g ha−1) or triclopyr (258.9 g ha−1) alone, or in combination at 20.8 + 258.9 or 20.8 + 517.8 g ha−1, respectively. Greenhouse and field results showed that topramezone applications in combination with triclopyr present opposite responses between bermudagrass and seashore paspalum. Topramezone increased bermudagrass injury and decreased seashore paspalum bleaching injury compared to topramezone alone. In field evaluations, topramezone + triclopyr at 15.6 + 690.4 g ha−1 used in sequential applications resulted in >90% injury to bermudagrass, however, injury decreased over time. Furthermore, sequential applications of topramezone + triclopyr at 15.6 + 690.4 g ha−1 resulted in >50% injury to seashore paspalum. Application programs including topramezone plus triclopyr should increase bermudagrass suppression and reduce seashore paspalum injury compared to topramezone alone. However, additional studies are needed because such practices will likely require manipulation of topramezone rate, application timing, application interval, and number of applications in order to maximize bermudagrass control and minimize seashore paspalum injury.

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