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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Morgan, M. M.;
Weinbrecht, J. L.;
McCarty, L. B. |
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| Author Affiliation: | University of Florida, Gainesville, FL 32611-0670 |
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| Title: | Bahiagrass mowing frequency reduction following imazameth (Plateauā¢) use |
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| Section: | Papers and Abstracts Presented
Other records with the "Papers and Abstracts Presented" Section
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| Meeting Info.: | 49th Annual Meeting, Charlotte, NC, January 15-17, 1996 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 49, 1996, p. 73-74. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 2 |
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| Abstract/Contents: | "Two field experiments were conducted in established 'Pensacola' bahiagrass (Paspalum notatum) in Central Florida. Both experimental sites were mowed initially on May 15, 1995. One experiment evaluated imazameth 2.0 EC at 0.07 kg ai haā»Ā¹ (4 oz pr/A) with various application times ranging from 7 days before to 24 days following mowing (DFM) and 1 hour before to 1 hour after single and double mowings. The second mowing was on June 1, 1995 for the double mowed treatments. The second experiment evaluated various imazameth rates and tank mixtures with several herbicides at one mowing interval. Treatments included imazameth 2.0 SC at 0.053, 0.093, and 0.14 kg haā»Ā¹ (3, 5, and 8 oz pr/A); glyphosate 4.0 SC at 0.17 and 0.42 kg haā»Ā¹ (5 and 12 oz pr/A); 2,4-D 3.8 SC at 0.28 kg haā»Ā¹ (8 oz pr/A); imazapyr 2.0 SC at 0.004 kg haā»Ā¹ (0.25 oz pr/A); trinexapac-ethyl 1.0 EC at 0.42 kg haā»Ā¹ (3 pt pr/A) and several combinations, thereof. All treatments in both experiments included X-77 at 0.25% v/v. Treatments for both experiments were replicated three times in a randomize complete block design. Plots in the first experiment were 10 ft x 10 ft and 10 ft x 25 ft in the second experiment. All treatments were applied with a COā backpack sprayer set to deliver 187 L haā»Ā¹. Plots were evaluated 1, 2, 3, 4, 7, and 8 weeks following mowing (WFM) for phytotoxicity (1 to 10; where 10=best turf; 1=dead turf and 5=minimally acceptable), turfgrass density (%), seedhead number (#/plot), leaf blade height (cm), and seedhead height (cm). In experiment one, all treatments achieved ā„5 for turf phytotoxicity throughout the study. The double mowed treatments had slightly greater reduction in leaf blade, seedhead heights and seedhead numbers compared to single mowing treatments. Fair (50% to 60%) density was achieved in single mowed treatments at 20 and 24 DFM, and double mowing treatments at 3 and 7 DRM. These applications were after drought stress periods. Optimum application window in conjunction with mowing frequency was 3 to 21 DFM. All treatments applied before mowing produced short-term unacceptable turf, but recovered by 11 weeks after treatment (WAT). In experiment two, all treatments achieved ā„5 for turf phytotoxicity throughout the study except at 8 WAT for imazameth at 0.14 kg haā»Ā¹, which recovered by 12 WAT. Good (>70%) density was achieved in all treatments at 2 and 4 WAT. At 8 WAT, however, all treatments had <50% density ratings except for tank mixture of imazameth + glyphosate + 2,4-D (0.053+0.168+0.28 kg haā»d]1) at 58%, trinexapac-ethyl (0.42 kg haā»Ā¹) at 73%, and untreated at 733% density. Remaining treatments recovered 12 WAT except imazameth at 0.14 kg haā»Ā¹, which recovered 16 WAT. All treatments in this second experiment reduced plant height throughout the rating period to 20 to 28 cm compared to untreated (>36 cm). All treatments with imazameth, including tank mixtures, achieved >66% rreduction in seedhead numbers per plot over trinexapac-ethyl and the untreated. In evaluating various herbicides for growth reduction, all treatments achieved >33% reduction in height of seedheads. In addition, treatments containing imazameth also achieved good (80 to 89%) globesedge (Cyperus globulosus) control 4 WAT. Overall, best seedhead and growth suppresion using imazameth in conjunction with mowing intervals were single mowing followed by spray application 3 to 21 DFM. Double mowing enhanced PGR activity but only slightly. Best seedhead and growth suppression treatments with minimum bahiagrass phytotoxicity or damage with the tank mixtures were imazameth alone at 0.053 kg haā»Ā¹; tank mixtures of imazameth + glyphosate + 2,4-D; and imazameth + imazapyr. Future research include repeat of 1995 study to determine best spray and mowing intervals, tank mixtures for growth and weed suppression, and soil moisture interaction with PGR efficacy on subsequent turf phytotoxicity." |
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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):
Morgan, M. M., J. L. Weinbrecht, and L. B. McCarty. 1996. Bahiagrass mowing frequency reduction following imazameth (Plateauā¢) use. South. Weed Sci. Soc. Proc. 49:p. 73-74. |
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