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| Web URL(s): | http://wssaabstracts.com/public/17/abstract-142.html
Last checked: 04/18/2013
http://wssaabstracts.com/public/17/proceedings.html
Last checked: 04/18/2013
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Smith, A. N.;
Askew, S. D. |
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| Author Affiliation: | Virginia Tech, Blacksbug, VA |
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| Title: | Late winter applications improve ethephon efficacy for annual bluegrass seedhead suppression |
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| Section: | Student presentions I
Other records with the "Student presentions I" Section
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| Meeting Info.: | Baltimore, Maryland: February 4-7, 2013 |
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| Source: | Proceedings of the Sixty-Seventh Annual Meeting of theNortheastern Weed Science Society. Vol. 67, 2013, p. 51. |
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| Publishing Information: | Baltimore, Maryland: Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Application timing; Chemical injury; Comparisons; Ethephon; Growth regulator evaluation; Poa annua control; Seedhead inhibition
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| Abstract/Contents: | "Annual bluegrass (Poa annua) is the most common weed found in creeping bentgrass putting greens. Attempts to remove annual bluegrass from putting greens usually prove futile, and thus the weed is generally accepted as part of the turf sward. A major component of annual bluegrass maintenance is seedhead suppression. Annual bluegrass seedheads generally occur in the spring, but sporadic seedheads may be found any time in winter. For seedhead suppression, applications of mefluidide + foliar iron or ethephon + trinexapac-ethyl are commonly applied at 50 growing degree days at base 50 (GDD50). Seedhead suppression from these applications is often inconsistent and additional applications may lead to turf injury. Given annual bluegrass plasticity and variations in seedhead initiation, the objectives of this study were to determine if early-winter applications of ethephon applied before a 50 GDD50 initiated spring program would improve annual bluegrass seedhead suppression. Two trials were conducted on creeping bentgrass putting greens mowed at 3mm at the Virginia Tech Golf Course in Blacksburg, VA and the Spotswood Country Club in Harrisonburg, VA. Treatments consisted of a base program of ethephon at 3.8 kg ai/ha + trinexapac-ethyl at 0.048 kg ai/ha applied first at 50 GDD50 and again 4 WAIT. This basic program was augmented to form the following treatments: 1) No early treatment, 2) ethephon at 3.8 kg ai/ha in January, 3) ethephon at 3.8 kg ai/ha in February, or 4) ethephon at 3.8 kg ai/ha in March. Treatments 5 and 6 included a comparison of mefluidide at 0.007 kg ai/ha + foliar iron applied at 50 GDD50 and again 4 WAIT, and a nontreated control. On April 6, at the Virginia Tech Golf Course, the nontreated plots averaged 66% seedhead coverage. Ethephon + trinexapac-ethyl initiated at 50 GDD50 averaged 45% coverage, and early treatments of ethephon initiated in January, February, and March averaged 6, 10, and 25% coverage, respectively. Mefluidide + foliar iron averaged 48% seedhead coverage. Similar trends were seen at Spotswood Country Club on April 26th. Ethephon early treatments initiated in January, February, and March averaged at 7, 6, and 18% coverage, respectively. Ethephon + trinexapac initiated at 50 GDD50 averaged 58% coverage, and mefluidide + foliar iron averaged 20% coverage with 10% turf injury. The nontreated plots averaged 91% seedhead coverage. These data suggest that January or February applications of ethephon can significantly improve seedhead suppression when applied with a 50 GDD50 ethephon + trinexapac-ethyl program." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Smith, A. N., and S. D. Askew. 2013. Late winter applications improve ethephon efficacy for annual bluegrass seedhead suppression. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 67:p. 51. |
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| Web URL(s):
http://wssaabstracts.com/public/17/abstract-142.html
Last checked: 04/18/2013
http://wssaabstracts.com/public/17/proceedings.html
Last checked: 04/18/2013
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 |
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