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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2011 Proceedings-SWSS.pdf#page=191
Last checked: 08/05/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Montgomery, D. P.;
Bell, G. E.;
Batten, S. M.;
Martin, D. L. |
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| Author Affiliation: | Oklahoma State University, Stillwater |
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| Title: | Response of Patriot, Riviera and Tifway bermudagrasses to aminocyclopyrachlor |
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| Section: | Weed management in turf
Other records with the "Weed management in turf" Section
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| Meeting Info.: | San Juan, Puerto Rico: January 24-26, 2011 |
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| Source: | 2011 Proceedings, Southern Weed Science Society. Vol. 64, 2011, p. 83. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Aminocyclopyrachlor; Application rates; Cultivar evaluation; Cynodon dactylon x Cynodon transvaalensis; Herbicide evaluation; Phytotoxicity
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| Cultivar Names: | Patriot; Riviera; Tifway |
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| Trade Names: | Imprelis |
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| Abstract/Contents: | "Research was conducted at the Oklahoma State University Turfgrass Research Center in Stillwater to evaluate different rates and sequential applications of Imprelis 2SL and GR (aminocyclopyrachlor) formulations for phytotoxicity on improved bermudagrasses at 100% greenup. The study was conducted on three bermudagrass cultivars, 'Patriot', 'Riviera', and 'Tifway' on different growing sites but within 400 yards of each other. All of the cultivars were mature having been in place for three years or more. However, the Tifway and to some extent the Patriot and Riviera experienced winter damage from an exceptionally cold 2009-10 winter in central Oklahoma. Severely damaged sections were avoided. Herbicide treatments evaluated included Imprelis 2SL at 0.0117, 0.023, and 0.0469 lb.a.i./A, alone, and applied as 4-week sequential treatments at similar rates. Imprelis 0.015G, 0.03G, and 0.05G were also evaluated as initial treatments at 0.0225, 0.045, and 0.075 lb.a.i./A, respectively. Also included for comparison was Imprelis 2SL at 0.0469 lb.a.i./A combined with 2,4-D amine at 0.25 lb.a.i./A plus non-ionic surfactant at 0.25% V/V applied at the time of sequential applications. Initial treatments were applied to the Patriot and Riviera on June 19 and June 18, respectively, with sequential treatments on July 19. Initial treatments were applied to Tifway on June 25 with sequential treatments on July 28. A randomized complete block experimental design with 4 replications of treatments was used. Plot size was 6 x 10 ft. The herbicide applications were applied using a CO2 pressurized R&D Brand bicycle sprayer operating at 22 psi and calibrated to deliver a carrier rate of 30 gpa. Mowing was withheld 2 days prior to and 5 days following applications. Irrigation was withheld for 48 hours following applications. The turf was mowed 1 time per week with clippings returned. Mowing height was 1.5 inches. The study was irrigated as needed to avoid wilting. Nitrogen was applied at 3.0 lb/1000 sq.ft. per year to the Patriot and Riviera blocks during the study. Nitrogen was applied at 4.0 lb/1000 sq.ft. per year to the Tifway to encourage recovery from winter damage. Phytotoxicity was assessed using a 0 to 5 whole number scale in the following manner: 0 = no phytotoxicity, 1 = minor yellowing, 2 = severe yellowing, 3 = <20% brown, 4 = >20% but <50% brown, 5 = >50% brown. A phytotoxicity rating of 1.0 would normally be acceptable to all fine turf areas, a rating of 2.0 would be acceptable for some fine turf areas as long as it was a short term (<= 14 days) affect and a rating of 3.0 would be unacceptable for most if not all turf areas. The phytotoxic effects on Patriot and Riviera were very minor. Yellowing was present on both cultivars in some plots beginning about 7 days-after-treatment (DAT) (0.3 to 1.0) but not evident at later evaluations. The yellowing was caused by the Imprelis applications but was so slight, especially on Patriot, that it could hardly be seen in photographs and may not have been noticeable if green grass had not been present nearby for comparison. The toxic effects on Tifway, however, were in some cases unacceptable for fine turf areas. Imprelis 2SL at 0.0117 and 0.023 lb.a.i./A produced very minor acceptable phytotoxicity (<= 1.0) when applied as a single application through 120 DAT evaluations. Imprelis 2SL at 0.0469 lb.a.i./A, applied as a single application, produced an unacceptable level of phytotoxicity of 1.3 (7 DAT), 3.8 (14 DAT) and 3.3 (30 DAT). All phytotoxicity from this treatment had diminished by 60 DAT. The addition of 2,4-D amine at 0.25 lb.a.i./A plus non-ionic surfactant to Imprelis 2SL at 0.0469 lb.a.i./A produced very similar levels and duration of phytotoxicity as that produced by Imprelis 2 SL applied alone at the same rate. Split applications of Imprelis 2SL at 0.0117 lb.a.i./A produced acceptable phytotoxicity throughout all evaluations. Split applications of Imprelis 2SL at 0.023 lb.a.i./A produced unacceptable levels of phytotoxicity of 2.5 (14 DAT) & 2.0 (30 DAT). The split application treatment of Imprelis 2SL at 0.0469 lb.a.i./A produced the greatest amount of Tifway phytotoxicity in this study. Tifway phytotoxicity from this treatment was significantly higher than all other Imprelis 2SL & Imprelis granular formulations with values of 4.0 (14 DAT) and 3.8 (30 DAT). Similar to all other Imprelis treatments all phytotoxicity had diminished by 60 DAT from this treatment. Imprelis granular treatments applied at 0.0225 & 0.045 lb.a.i./A produced no Tifway phytotoxicity throughout the duration of this study. Imprelis granular treatments at 0.0750 lb.a.i./A produced a small amount of phytotoxicity at 14 DAT (1.3) and 30 DAT (1.0). All phytotoxicity had diminished from this treatment at later evaluations." |
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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):
Montgomery, D. P., G. E. Bell, S. M. Batten, and D. L. Martin. 2011. Response of Patriot, Riviera and Tifway bermudagrasses to aminocyclopyrachlor. South. Weed Sci. Soc. Proc. 64:p. 83. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2011 Proceedings-SWSS.pdf#page=191
Last checked: 08/05/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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