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| Web URL(s): | http://www.newss.org/proceedings/proceedings_2004_vol58.pdf#page=131
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): | Watschke, T.;
Borger, J. |
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| Author Affiliation: | Penn State University, University Park, Pennsylvania |
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| Title: | Seedhead suppression of annual bluegrass |
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| Section: | Turfgrass and plant growth regulators section
Other records with the "Turfgrass and plant growth regulators section" Section
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| Meeting Info.: | Marriott Cambridge Center, Cambridge, Massachusetts: January 5-8, 2004 |
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| Source: | Proceedings: NortheasternWeed Science Society. Vol. 58, 2004, p. 131-132. |
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| Publishing Information: | Ithaca, NY: Northeastern Weed Science Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Adjuvants; Growth regulator evaluation; Poa annua control; Seedhead inhibition
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| Abstract/Contents: | "The first study was conducted on a mixed stand of creeping bentgrass (Agrostis stolonifera) and annual bluegrass (Poa annua) at the Penn State Blue Golf Course in State College, PA. The objective of the study was to evaluate selected growth regulators, with and without adjuvants, for the seedhead suppression of annual bluegrass. Treatments were applied on April 23, 2003 (BOOT) and for the Proxy/Primo combination again on May 13, 2003 (3 WAT) using a three-foot CO2 powered boom sprayer calibrated to deliver 40 GPA using two 11004 flat fan nozzles at 40 PSI. The turf was maintained using cultural practices for irrigation, mowing, and fertilization that would be typical for a putting green. Ratings were taken on May 2 for phytotoxicity and on May 20 for turf quality and seedhead suppression. The turf quality ratings were and [an] amalgamation of color, density, texture, and seedhead suppression. Phytotoxicity was rated nine days after the April 23 application date, which was considered to be when the annual bluegrass seedheads were in the "BOOT" stage of development. Phytotoxicity ratings below 7 were considered to be unacceptable. Turf treated with Embark alone at 40 oz/A and in combination with MacroSorb Foliar at 4 and 8 oz/M, MacroSorb Foliar with and without Minors at 1.5 oz/M, and GBJ1 at 4 oz/M, was rated as having unacceptable phytotoxicity. On May 20, the lowest quality rating was observed for nontreated turf, primarily because of emerged seedheads. Turf having the best combination of quality and seedhead suppression was treated with Primo MAXX (0.125 oz/M) plus Proxy (3 oz/M) applied twice, Primo MAXX (0.125 oz/M) plus Proxy (5 oz/M) plus MacroSorb Foliar (4 and 8 oz/M) applied once, and Primo MAXX (0.125 oz/M) plus Proxy (5 oz/M) applied once. When the Primo MAXX rate was reduced to 0.06 oz/M in combination with Proxy (3 oz/M) and MacroSorb Foliar (8 oz/M), quality was very good (8.5), as was seedhead suppression (82%). It appears that the addition of MacroSorb Foliar at 8 oz/M to lower the rates of both Primo MAXX and Proxy enhanced quality without causing a significant loss of seedhead suppression. The second study was conducted on a mature annual bluegrass (Poa annua) stand at the Valentine Research Center, University Park[,] Pa [PA]. The objective of the study was to evaluate selected growth regulators, with and without adjuvants, for the seedhead suppression of annual bluegrass maintained at a fairway height of cut. Treatments were applied on April 23, 2003 (BOOT STAGE) using a three-foot CO2 powered boom sprayer calibrated to deliver 40 GPA usint two 11004 flat fan nozzles at 40 PSI. The turf was maintained using cultural practices for irrigation, mowing, and fertilization that would be typical for a golf course fairway. Phytotoxicity rated on May, 2, 2003 revealed that turf treated with Cutless plus Primo at 0.25 lb ai/A and 0.25 oz/M respectively, Cutless plus Primo at the same rates, but with the addition of MacroSorb Foliar at 2 OX/M, and Cutless plus Primo at the same rates but with the addition of GBJ1 at 2 oz/M had unacceptable ratings (below 7.0). These same treatments provided excellent seedhead suppression (90%) on this rating date, but by the second rating date (May 19) these treatments provided the poorest suppression of seedheads. The best treatments, when both injury and degree of suppression were considered were Embark T/O at 60 oz/A plus GBJ1 at 2 oz/M and 4 oz/M, embark at 60 oz/M, plus Coron at 0.2 lbs N/M and Embark at 60 oz/A, plus Coron at 0.2 lbs N/M plus MacroSorb Foliar at 2 oz/M." |
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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):
Watschke, T., and J. Borger. 2004. Seedhead suppression of annual bluegrass. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 58:p. 131-132. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_2004_vol58.pdf#page=131
Last checked: 07/23/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 v. 57 |
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