| |
| Web URL(s): | http://www.newss.org/proceedings/proceedings_2006.pdf#page=111
Last checked: 07/22/2013
Requires: PDF Reader
Notes: Item is within a single large file |
|---|
| Publication Type:
| Report |
|---|
| Content Type: | Abstract or Summary only |
|---|
| Author(s): | Askew, S. D.;
Willis, J. B.;
Ricker, D. B.;
McCall, D. S. |
|---|
| Author Affiliation: | Virginia Tech, Blacksburg, Virginia |
|---|
| Title: | Using black sand and GDD50 to improve timing of annual bluegrass seedhead suppression |
|---|
| Section: | Turfgrass and plant growth regulators II
Other records with the "Turfgrass and plant growth regulators II" Section
|
|---|
| Meeting Info.: | Providence, RI: January 3-6, 2006 |
|---|
| Source: | Proceedings: NortheasternWeed Science Society. Vol. 60, 2006, p. 106. |
|---|
| Publishing Information: | Ithaca, NY: Northeastern Weed Science Society |
|---|
| # of Pages: | 1 |
|---|
| Keywords: | TIC Keywords: Herbicide timing; Poa annua; Seedhead inhibition; Suppression; Weed control; Herbicide resistance; Growing degree days; Application methods; Herbicide evaluation; Poa annua control; Sand topdressings; Growth regulators
|
|---|
| Abstract/Contents: | "Creeping bentgrass (Agrostis stolonifera L.) (CBG) putting greens are often infested with annual bluegrass (Poa annua L.) (ABG), which is hard to control and disrupts uniformity and ball roll during seedhead production in spring. Superintendents use plant growth regulators (PGR) such as mefluidide, trinexapac ethyl, and ethephon to improve uniformity and suppress ABG seedhead formation. A mixture of trinexapac ethyl and ethephon is widely used for this purpose but is dependent on proper application timing for effective ABG seedhead suppression. Previous research was aimed at predicting optimal application timing using growing degree days (GDD50) and found that approximately 50 GDD50 was an optimal timing in Virginia and Pennsylvania in 2004. However, GDD50 are accumulated at varying times in early spring and differences occur each year in how and when GDD50 are accumulated. Thus, proper application timing for trinexapac ethyl plus ethephon is still difficult to determine. Black sand has been used to melt snow and ice on greens and found to improve early greenup. We hypothesized that black sand top dressing could increase T and GDD50 accumulation and allow a more predictable initiation of ABG seedhead production and improved application timing for PGR. A study was initiated at the Virginia Tech Golf Course in Blacksburg on March 15. Four replications were used in a randomized complete block design and treatments were arranged in a slipt plot with two main plots (with and without 896 kg/ha black sand) and 5 application timings for trinexapac ethyl+ethephon (nontreated, Mar 25, Mar 31, Apr 8, and Apr 15). Ethephon and trinexapac ethyl were applied at 2.29 and 0.05 kg ai/ha, respectively initially at the aformentioned times and again one month later. ABG cover, seedhead cover, and CBG injury were visually estimated as a percentage of total plot area. Turfgrass color and quality were rated on a scale of 1 to 9 where is 1 dead turf, 5 is acceptable, and 9 is dark color or uniform and dense quality turf. Relative chlorophyll content was assessed with a CM1000 chlorophyll analyzer. Surface T was evaluated with an infrared analyze4r and subsurface T was logged at just below surface and 7 cm deep with Hobo probes set to record every 30 min. Black sand increased surface T on Mar 18 and 25 and increased GDD50 accumulation rate. Turfgrass color and quality was improved by black sand for all plots evaluated on Mar 25, Apr 1, and Apr 7 but differences were no longer apparent on Apr 15 and beyond. Thus, putting green "greenup" occured 21 d earlier when black sand was applied. ABG seedhead cover was first observed on Mar 25 in selected black sand plots at ā¤1% . On Apr 1, ABG seedhead cover differed and was 7-10% in black sand plots and O to 1% in plots that were not top-dressed. On Apr 22, ABG seedheads covered 25-33% of nontreated plots and the 2 earlier application timings were more effective than later timings. Ethephon + trinexapac ethyl treatments were more effective when black sand was not applied. Seedhead control was rated 56, 80, 13, and 39% as application times increased in black plots and 75, 88, 51, and 3% as application timings increased in normal plots. Seedhead suppression was acceptable and acceptable and equivalent between all treated plots on May 17 after sequential treatments had been applied." |
|---|
| Language: | English |
|---|
| References: | 0 |
|---|
| Note: | This item is an abstract only! |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Askew, S. D., J. B. Willis, D. B. Ricker, and D. S. McCall. 2006. Using black sand and GDD50 to improve timing of annual bluegrass seedhead suppression. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 60:p. 106. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=112716 |
| If there are problems with this record, send us feedback about record 112716. |
| Choices for finding the above item: |
|---|
| Web URL(s):
http://www.newss.org/proceedings/proceedings_2006.pdf#page=111
Last checked: 07/22/2013
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: SB 610 .N62 v. 60 |
| Find from within TIC:
Digitally in TIC by file name: newss2006 |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
