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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2004%20Proceedings-SWSS.pdf#page=207
Last checked: 07/17/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | McCarty, L. B.;
Estes, A. G. |
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| Author Affiliation: | Department of Horticulture, Clemson University, Clemson, SC |
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| Title: | Velocity (bispyribac-sodium) for selective postemergence Poa annua control in cool-season turf |
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| Section: | Weed management in turf crops
Other records with the "Weed management in turf crops" Section
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| Meeting Info.: | Memphis, Tennessee: January 26-28, 2004 |
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| Source: | Proceedings: Southern Weed Science Society: 57th Annual Meeting. Vol. 57, 2004, p. 109. |
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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: Acetolactate synthase-inhibiting herbicides; Bispyribac-sodium; Cool season turfgrasses; Grass postemergence herbicides; Herbicide efficacy; Herbicide evaluation; Poa annua control
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| Trade Names: | Velocity |
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| Abstract/Contents: | "Bispyribac-sodium (Velocity 80S) recently received a 24c label for selective, late-season annual bluegrass (Poa annua L.) control in bermudagrass overseeded with perennial ryegrass in several southern USA states. Its mode of action is an inhibitor of acetolactate synthase (ALS) enzyme necessary for formation of the branch chain amino acids, valine, leucine and isoleucine. Bispyribac-sodium was initially used for grass (especially Echinochloa spp.), sedge and broadleaf weed control in rice. Several experiments were conducted in 2003 all arranged as randomized complete blocks with three replications to evaluate its efficacy on Poa annua control and turf safety. Treatments were applied in February, March and/or April at 1.3 to 2.6 oz product per acre to a naturally infested annual bluegrass 'Tifway' bermudagrass golf course fairways overseeded with 250 to 300 lbs per acre perennial ryegrass. Plot size were 6 sq.m. with treatments applied using a CO2-powered backpack sprayer calibrated at 20 GPA (187 l/ha) and plots mowed at 1.3 cm (0.5 inch) three times weekly. Data analyzed included visual weed control percentages and turf injury from 0 to 100 where 30% was maximum acceptable. Data was analyzed using ANOVA with means separated with LSD (0.05). Postemergence Poa annua control with mid-February applications in South Carolina in 2003 at either the 1.3 or 2.6 oz/acre were ineffective (<10% control) over four different experiments when final control ratings were made in late-April. Mid-March application at either rate was highly effective (>=95%) in control. Early-April applications (April 4th) also provided excellent (>=93%) control at the 2.6 oz/a rate. Repeat monthly applications were also made but control was unacceptable unless March and/or April applications were included. In comparison, ethofumesate (Prograss 1L) applied at 1 gallon per acre in February, March or February+March provided no annual bluegrass control. Perennial ryegrass turf phytotoxicity was minimum (<=15%) with all application rates and timings. Highest (15%) phytotoxicity resulted with 2.6 oz/acre applied in February plus March. A single application of 5.2 oz per acre in mid-March caused temporary ryegrass phytotoxicity (~30%) for approximately 3 weeks. This would simulate an overlap application scenario. No damage or delay in bermudagrass green-up was noted for any treatment in any study. An additional study was performed on 'Penncross' creeping bentgrass (Agrostis palustris) golf course fairway to determine its tolerance to bispyribac-sodium. April and May applications at 1.3 or 2.6 oz per acre caused only minor (<10%) turf phytotoxicity. One interesting side-note was the lack of dollar spot disease (Sclerotinia homoeocarpa) occurrence in bispyribac-sodium treated plots. Early April or May treatments at 1.3 or 2.6 oz/acre had <15% dollarspot occurrence through July 7, 2003 while untreated, paclobutrazol (Trimmit), trinexapac-ethyl (Primo MAXX) or ethephon (Proxy) treated plots had between 25 and 70% occurrence during the same time frame. verall, mid-March or early-April bispyribac-sodium applications at 1.3 or 2.6 oz/a provided excellent control of annual bluegrass in overseeded ryegrass. February applications in 2003 in SC provided unacceptable control. Additional research should be performed on reducing ryegrass phytotoxicity with iron and/or nitrogen timing and rate applications and to substantiate Poa annua control with bispyribac-sodium throughout a wider geographical region. |
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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):
McCarty, L. B., and A. G. Estes. 2004. Velocity (bispyribac-sodium) for selective postemergence Poa annua control in cool-season turf. South. Weed Sci. Soc. Proc. 57:p. 109. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2004%20Proceedings-SWSS.pdf#page=207
Last checked: 07/17/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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