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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2005 Proceedings-SWSS.pdf#page=193
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): | Breeden, G. K.;
McElroy, J. S. |
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| Author Affiliation: | University of Tennessee |
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| Title: | Weed control during establishment of heat-tolerant bluegrass (Poa pratensis X Poa arachnifera) from seed |
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| Section: | Weed management in turfgrass
Other records with the "Weed management in turfgrass" 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. 118. |
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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; Evaluations; Heat resistance; Poa pratensis X Poa arachnifera; Weed control
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| Abstract/Contents: | "Spring establishment of cool season grasses is problematic due to the intense competition from crabgrass (Digitaria spp.) and other competitive weed species. Quinclorac is useful in controlling crabgrass during seeded establishment, however injury to bluegrass (Poa spp.) can occur during the initial stages of seedling development and the spectrum of broadleaf weed control is minimal. Mesotrione is a new herbicide that is currently being adapted to the turfgrass market. Heat-tolerant (HT) bluegrass (Poa pratensis x P. arachnifara) is a new turfgrass that is being grown in the transition zone where tall fescue (Festuca arundinacea) is widely grown. Field research was initiated in 2004 to evaluate HT-bluegrass tolerance to mesotrione and quinclorac during seeded establishment. Research was conducted in Knoxville, TN at Knoxville Experiment Station - Plant Science Unit. HB-129 'Thermalblue' HT bluegrass was seeded on March 24, 2004 with a broadcast spreader at a rate of 3 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., with additional applications made throughout the experiment every 28 days. 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. Mesotrione applied 14 DAE at 0.125 lb ai/a and 0.25 lb ai/a injured HT bluegrass < 15% at 7 days after treatment (DAT). No injury was observed from these treatments by 14 DAT or throughout the rest of the study. Quinclorac applied 14 DAE at 0.75 lb ai/a and 1.5 lb ai/a injured HT bluegrass <= 3% at 7 DAT. Quinclorac injury increased to 25-30% by 14 DAT. Injury from these treatments decreased to <= 10% by 21 DAT and continued to decrease throughout the rest of the study. Injury from single applications of mesotrione was moderate and did not persist as long as injury from quinclorac. Sequential mesotrione applications at 0.125 lb ai/a and 0.25 lb ai/a injured HT bluegrass < 30% by 21 days after initial treatment (DAIT). No injury was observed from these treatments at any other time during the study. Sequential applications of quinclorac at 0.75 lb ai/a injured HT bluegrass 24% at 14 DAIT. Quinclorac injury decreased to 6% by 21 DAIT and continued to decrease throughout the study. Injury from sequential applications of mesotrione was higher than single applications of mesotrione. Injury from sequential applications also did not persist as long as injury from quinclorac. Mesotrione injury often had dissipated by 14 DAT. All treatments controlled smooth crabgrass >= 88% at 13 weeks after emergence (WAE) except mesotrione at 0.125 lb ai/a (single and double applications). Mesotrione applied twice at 0.125 lb ai/a controlled smooth crabgrass 81% at 13 WAE. Single application of mesotrione at 0.125 lb ai/a was the only treatment below 70% at 13 WAE. Single and sequential applications of mesotrione and single applications of quinclorac are both effective in controlling smooth crabgrass. However, a mesotrione rate of 0.25 lb ai/a is essential for acceptable control." |
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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):
Breeden, G. K., and J. S. McElroy. 2005. Weed control during establishment of heat-tolerant bluegrass (Poa pratensis X Poa arachnifera) from seed. South. Weed Sci. Soc. Proc. 58:p. 118. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2005 Proceedings-SWSS.pdf#page=193
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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