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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2011 Proceedings-SWSS.pdf#page=187
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): | Brosnan, J. T.;
Elmore, M. T.;
Kopsell, D. A.;
Breeden, G. K.;
Armel, G. R. |
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| Author Affiliation: | University of Tennessee, Knoxville |
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| Title: | Differential responses to bermudagrass to three HPPD inhibiting herbicides |
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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. 79. |
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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: Cultivar evaluation; Cynodon dactylon; Cynodon dactylon x Cynodon transvaalensis; Herbicide evaluation; Mesotrione; Physiological responses; Tembotrione; Topramezone
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| Cultivar Names: | Tifway; Riviera |
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| Abstract/Contents: | "Bermudagrass (Cynodon spp.) is a problematic weed throughout the United States transition zone. The 4- hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor mesotrione has been shown to temporarily injure bermudagrass. Data describing the physiological effects of other HPPD inhibiting herbicide are limited. Separate studies were conducted evaluating the physiological effects of mesotrione, topramezone, and tembotrione applications to 'Riviera' common bermudagrass (Cynodon dactylon (L.) Pers.) and 'Tifway' hybrid bermudagrass (C. dactylon (L.) Pers. x. C. transvaalensis Burtt-Davy). Cores (6 x 5 cm) of each species were transplanted into greenhouse pots containing peat moss (55%), perlite (25%), and vermiculite (20%). Average temperature in the greenhouse measured 29 C. During the three weeks prior to application plants were clipped at 2 cm and fertilized bi-weekly at 5.2 kg N ha-1. Treatments were arranged in a 3 x 3 factorial, randomized complete block design, with three replications. Bermudagrass plants were treated with three rates of mesotrione (0.28, 0.35, and 0.42 kg ha-1), topramezone (0.018, 0.025, and 0.038 kg ha-1), and tembotrione (0.092, 0.184, and 0.276 kg ha-1). The lowest rate of each herbicide represented the maximum-labeled use rate for a single application. All herbicides were mixed with a methylated seed oil surfactant at 0.25% v/v. Treatments were applied with a CO2 powered boom sprayer calibrated to deliver 280 L ha-1 using four, flat-fan, nozzles at 124 kPa. Percent visual bleaching was measured at 3, 7, 14, 21, 28 and 35 days after application (DAA) on a 0 (green leaf tissue) to 100% (white leaf tissue) scale. After visually assessing percent bleaching, leaf tissue above 2 cm was harvested and frozen at -80 C. Chlorophyll and carotenoid pigments in each sample were extracted from these tissues and quantified using high-performance liquid chromatography. Topramezone and tembotrione bleached bermudagrass leaf tissues to a greater degree than mesotrione. Concomitantly, topramezone and tembotrione also reduced total chlorophyll (chlorophyll a + b), β-carotene, lutein, and total xanthophyll cycle pigment concentrations (zeaxanthin + antheraxanthin + violaxanthin) more than mesotrione. For both topramezone and tembotrione, peak reductions in chlorophyll and carotenoid pigments were detected 14 to 21 day intervals. Topramezone showed greater activity than mesotrione or tembotrione on Tifway hybrid bermudagrass, as the lowest rate of topramezone evaluated (0.018 kg ha-1) reduced total chlorophyll, lutein, and total xanthophyll cycle pigment concentrations greater than the lowest rates of either mesotrione (0.28 kg ha-1) or tembotrione (0.092 kg ha-1) during periods of peak visual bleaching (14 to 21 DAA). In Riviera, topramezone and tembotrione increased the percentage of zeaxanthin + antheraxanthin in the total xanthophyll cycle pigment pool (ZA/ZAV) 7 days after peak visual bleaching was observed, and ZA/ZAV decreased as visual bleaching subsided. Increases in ZA/ZAV were not observed after peak visual bleaching on Tifway hybrid bermudagrass. Increases in photoprotective xanthophyll cycle pigments (ZA/ZAV) 14 to 21 DAA may be a mechanism allowing common bermudagrass to recover from HPPD inhibiting herbicide injury, as all Riviera bermudagrass recovered from treatments by 35 DAA. Data in the current study will allow turf managers to design physiologically validated bermudagrass control programs with HPPD inhibiting herbicides." |
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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):
Brosnan, J. T., M. T. Elmore, D. A. Kopsell, G. K. Breeden, and G. R. Armel. 2011. Differential responses to bermudagrass to three HPPD inhibiting herbicides. South. Weed Sci. Soc. Proc. 64:p. 79. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2011 Proceedings-SWSS.pdf#page=187
Last checked: 08/05/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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