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| Web URL(s): | http://www.newss.org/proceedings/proceedings_2006.pdf#page=119
Last checked: 07/23/2013
Requires: PDF Reader
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): | Askew, S. D.;
Spak, D. R.;
Barker, W. L.;
Willis, J. B.;
Ricker, D. B. |
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| Author Affiliation: | Virginia Tech, Blacksburg, Virginia |
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| Title: | Degree day for predicting annual bluegrass seedhead emergence |
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| Section: | Abstracts from the 59TH Annual Meeting
Other records with the "Abstracts from the 59TH Annual Meeting" Section
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| Meeting Info.: | Providence, RI: January 3-6, 2006 |
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| Source: | Proceedings: NortheasternWeed Science Society. Vol. 60, 2006, p. 114. |
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| Publishing Information: | Ithaca, NY: Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Plant growth regulators; Application timing; Seedhead inhibition; Weed control; Herbicide application; Poa annua; Growing degree days
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| Abstract/Contents: | "Determining proper timing of plant growth regulators (PGR's) for annual bluegrass (Poa annua) is difficult. The most common plant growth regulators (PGR's) used to suppress annual bluegrass seedheads on golf putting greens include ethephon (Proxy) and mefluidide (Embark). Melfuidide, although effective for AB seedhead suppression, consistently discolors desirable creeping bentgrass. Recent research has indicated that mixtures of ethephon and trinexapac ethyl (Primo) (E+T) can suppress AB seedheads and improve putting green aesthetics in a single treatment. Although potentially effective for AB seedhead suppression, E+T can be inconsistent and ineffective when applied too early or too late. A mixed creeping bentgrass and AB putting green in Blacksburg, VA and Fairway in Lancaster, PA was treated with E+T at different times and both soil temperature and Forsythia (Forsythia x intermedia) bloom phenology were evaluated. Our objective was to determine biological indicators of AB bloom initiation and optimal timing for PGR treatment and to compare on-site soil temperature data to local weather station data for GDD estimation. AB first bloomed upon sustained soil temperatures of greater than 13 C on April 15 in VA and April 20 in PN. Soil and air DD50 values varied by only two days for predicting annual bluegrass seedhead emergence. First annual bluegrass bloom occured at both locations when GDD50 reached a cumulative value between 61 and 90. At this time, Forsythia blooms on north-facing slopes first began to drop and Forsythia blooms on south-facing slopes had dropped 50%. Treatments applied within two weeks of seedhead production were most effective for AB seedhead suppression. Preliminary estimates are the E+T should be applied at a cumulative GDD50 of 50 or when Forsythia is in full bloom but bloom drop has not occured." |
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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):
Askew, S. D., D. R. Spak, W. L. Barker, J. B. Willis, and D. B. Ricker. 2006. Degree day for predicting annual bluegrass seedhead emergence. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 60:p. 114. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_2006.pdf#page=119
Last checked: 07/23/2013
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: SB 610 .N62 v. 60 |
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Digitally in TIC by file name: newss2006 |
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