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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2004%20Proceedings-SWSS.pdf#page=311
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): | Barker, W. L.;
Kaufman, N. M.;
Askew, S. D. |
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| Author Affiliation: | Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute & State University, Blacksburg, VA |
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| Title: | Persistence of rimsulfuron on perennial ryegrass and annual bluegrass foliage |
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| Section: | Physiological and biological aspects of weed control
Other records with the "Physiological and biological aspects of weed control" 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. 213. |
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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: Herbicide efficacy; Herbicide evaluation; Herbicide persistence; Lolium perenne; Poa annua; Residues; Rimsulfuron
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| Abstract/Contents: | "In the climatic transition zone, bermudagrass [Cynodon dactylon (L.) Pers.] fairways are typically overseeded with perennial ryegrass (Lolium perenne L.). However, turfgrass management can be difficult during transition back to a bermudagrass monoculture in the spring. To speed transition and avoid competition between perennial ryegrass and post-dormant bermudagrass, herbicides are often used to control perennial ryegrass. Field studies have shown that rimsulfuron can move laterally or "track" and injure neighboring cool-season grasses, therefore, persistence and stability of rimsulfuron on turf foliage was assessed. Our objectives were to determine amounts of water extractable rimsulfuron remaining on perennial ryegrass and annual bluegrass (Poa annua L.) foliage over time. Two trials were conducted in a completely randomized design. Treatments were arranged in a split plot design with harvest times as main plots and plant species as subplots (either perennial ryegrass or annual bluegrass). Each treatment was replicated three times per trial. Perennial ryegrass and annual bluegrass were chosen because rimsulfuron is commonly used to control them in areas adjacent to sensitive creeping bentgrass (Agrostis stolonifera L.) putting greens. Plants were harvested from the field, separated to two tillers, planted in 50 ml 0.25-strength Hoaglands solution, and allowed to acclimate in a growth chamber at 18.5/12.5 C day/night temperature and 50/80% day/night relative humidity for one week. Lighting was maintained for the 14-hour day period at 110 μmols photons/m2/second of photosynthetically active radiation. After acclimation, the first and second fully-expanded leaves on each tiller were treated with [pyrimidine- 2-14C}-rimsulfuron and misted each night to simulate dew. Plants were harvested at 0.06, 12, 24, 48, 72, and 96 hours after treatment. Plants were clipped at ground level, rinsed with water, rinsed with methanol, and combusted in a biological oxidizer. An aliquot of each rinse was removed and radioactivity was determined using a liquid scintillation spectrometer. Water rinses were subjected to thin layer chromatography (TLC) to determine the fraction of stable rimsulfuron over time. Methanol rinses were not subjected to thin layer chromatography due to insufficient radioactivity counts. Utilizing water rinse data from chromatograms it was determined 50% of the applied rimsulfuron was water extractable after 24 hours. At 96 hours after treatment, 40% of applied rimsulfuron was water extractable. A substantial amount of stable rimsulfuron persists on turf foliage for up to 4 days. These data concur with several reports by Virginia golf course superintendents and additional field research conducted at Virginia Tech that rimsulfuron may be dislodged from wet turfgrass and tracked onto sensitive creeping bentgrass. These results indicate that turfgrass treated with rimsulfuron should be irrigated to rinse chemical residue from foliage before mowing in an effort to prevent lateral relocation and injury of sensitive species." |
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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):
Barker, W. L., N. M. Kaufman, and S. D. Askew. 2004. Persistence of rimsulfuron on perennial ryegrass and annual bluegrass foliage. South. Weed Sci. Soc. Proc. 57:p. 213. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2004%20Proceedings-SWSS.pdf#page=311
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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