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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2005 Proceedings-SWSS.pdf#page=210
Last checked: 07/18/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | McElroy, J. S.;
Breeden, G. K. |
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| Author Affiliation: | University of Tennessee, Knoxville, TN |
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| Title: | Utilizing mesotrione for seeded establishment of turf-type tall fescue |
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| Section: | Weed control options during establishment & grow-in of warm-season turf species
Other records with the "Weed control options during establishment & grow-in of warm-season turf species" Section
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| Meeting Info.: | Charlotte, North Carolina: January 24-26, 2005 |
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| Source: | Proceedings of the 58th Annual Meeting of the Southern Weed Science Society. Vol. 58, 2005, p. 135. |
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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: Establishment; Festuca arundinacea; Grow in; Herbicide evaluation; Mesotrione; Seeding; Warm season turfgrasses; Weed control
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| Abstract/Contents: | "Mesotrione is currently being evaluated for potential usage in the turfgrass market. Mesotrione is an inhibitor of 4- hydroxyphenylpyruvate dioxygenase (HPPD; EC 1.13.11.27) enzyme activity. In plants, HPPD converts 4- hydroxymethylpyruvate to homogentisate, which is a precursor to plastoquinone and α-tocopherol. Plastoquinone is a cofactor in phytoene desaturase, the precursor to all carotenoids. Depletion of carotenoids yields a bleached white appearance, free radicals accumulate, and plant necrosis ensues. If labeled for use in turfgrass systems, mesotrione will be the first "bleaching," carotenoid production-inhibiting herbicide to be used in turfgrass systems. Introduction of new herbicide chemistry to new agronomic areas often leads to the discovery of unforeseen novel herbicide usage. In the case of mesotrione, researchers have recently demonstrated that it could potentially be safely used during seeded establishment of certain turf species. Further research is needed evaluating specific timings, rates, and multiple applications to assess the safety of mesotrione applied during seeded establishment of turf-type tall fescue. Research was conducted in Knoxville, TN at Knoxville Experiment Station - Plant Science Unit. For our spring establishment study, 'Kittyhawk' turf-type tall fescue was seeded on March 24, 2004 with a broadcast spreader at a rate of 6 lbs/1000 sq. ft. and cotton germination blanket was applied for two weeks. A complete starter fertilizer (24-6-12) was applied at planting at a rate of 1lb N/1000 sq. ft. No additional fertilization was added during the experiment. Treatments were replicated four times in a randomized complete block design. Herbicides were applied with a CO2 pressurized sprayer and a 4 ft. boom with a pressure of 26 PSI and 8002XR flat fan nozzles. Mesotrione treatments included were 0.125 and 0.25 lb ai/a applied in a single application at 14 days after emergence (DAE), applied twice at 28 and 42 DAE, and applied three times at 14, 28 and 42 DAE. Quinclorac treatments were 1.5 lb ai/a and 0.75 lb ai/a applied in a single application at 14 DAE. All mesotrione treatments contained 0.25 % v/v NIS and quinclorac treatments had 1.5 pt/a MSO. Experimental units were 5 ft by 5ft. Weed control and turf injury were evaluated visually utilizing a 0% (no weed control or turf injury) to 100% (complete weed control or turf injury) scale. For our fall establishment study, 'Kittyhawk' turf-type tall fescue was seeded on August 30, 2004 at the same rate and fertility applications as the spring study. Spring and fall studies were identical in application methodologies. Nine treatments, including a non-treated, were included in the study. For the eight herbicide treatments, mesotrione was applied at either 0.125 or 0.25 lb ai/a at 0, 7, 14, or 28 DAE. Mesotrione treatments included NIS at 0.25% v/v. In the spring study, for all single application mesotrione treatments regardless of rate, tall fescue injury peaked at 7 days after treatment (DAT) and injury dissipated by 14 DAT. At 7 DAT, no single application of mesotrione ever exceeded 20% injury. Multiple applications demonstrated similar safety compared to single applications with <20% tall fescue injury observed 7 DAT with two or three biweekly sequential applications and injury dissipation by 14 DAT. Quinclorac applied at 0.75 and 1.5 lb ai/a injured tall fescue 30% 14 DAT. Injury from quinclorac slowly dissipated and was unapparent by 28 DAT. Tall fescue injury from quinclorac produced an epinastic twisting of the leaves, however no plant necrosis was observed. In the fall study, preemergence, 7, and 14 DAT mesotrione applications, regardless of rate, did not injure tall fescue at any rating date. Mesotrione applied at 0.125 and 0.25 lb ai/a 28 DAE, however, injured tall fescue 13 and 23% at 14 DAT. Injury from these applications did not dissipate completely until 28 DAT. It is hypothesized that the decrease in average daily temperature after the 28 DAE applications to ~<= 60 F exacerbated the injury from these applications due to decreased physiological activity and thus, decreased herbicide metabolism. Despite injury variation, mesotrione did not reduce tall fescue turf cover compared to the non-treated at any rating date, regardless of application timing or rate. These data indicate that mesotrione is safe for use as preemergence or early postemergence herbicide on newly seeded tall fescue." |
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| Language: | English |
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| References: | 0 |
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| Note: | "The changing world of weed science"
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McElroy, J. S., and G. K. Breeden. 2005. Utilizing mesotrione for seeded establishment of turf-type tall fescue. South. Weed Sci. Soc. Proc. 58:p. 135. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2005 Proceedings-SWSS.pdf#page=210
Last checked: 07/18/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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