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Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2004%20Proceedings-SWSS.pdf#page=309 Last checked: 07/17/2013 Requires: PDF Reader Notes: Item is within a single large file |
Publication Type:
| Report |
Author(s): | McElroy, J. S.;
Yelverton, F. H.;
Burke, I. C.;
Wilcut, J. W. |
Author Affiliation: | Crop Science Department, NC State University, Raleigh, NC |
Title: | Absorption, tranloscation, and metabolism of CGA-362622 and halosulfuron in green and false-green kyllinga |
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 |
Source: | Proceedings: Southern Weed Science Society: 57th Annual Meeting. Vol. 57, 2004, p. 211. |
Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
# of Pages: | 1 |
Keywords: | TIC Keywords: Absorption; Comparisons; Halosulfuron; Herbicide efficacy; Herbicide evaluation; Kyllinga brevifolia; Kyllinga gracillima; Metabolism; Translocation; Trifloxysulfuron
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Trade Names: | CGA-362622 |
Abstract/Contents: | "Green kyllinga (Kyllinga brevifolia Rottb.) and false-green kyllinga (Kyllinga gracillima L.) are rhizomatous perennial sedge species (Cyperaceae) that are weeds of managed turfgrass systems. Both are tolerant to mowing heights >=1.2 cm and are more invasive under saturated soil moisture conditions. Additionally, both species are difficult to control with currently registered herbicides, most likely due to the difficulty in eliminating rhizomes. Halosulfuron is commonly used to control perennial sedges species, including green and false-green kyllinga, in managed turfgrass. CGA-362622 (trifloxysulfuron) was recently introduced for use in turfgrass systems and research indicates that it provides greater control of green and false-green kyllinga than halosulfuron. Research is needed, therefore, to evaluate the reason for variation in control of green and false-green kyllinga between these seemingly similar sulfonylurea herbicides. Studies were conducted to evaluate the absorption, translocation, and metabolism of 14C-halosulfuron and 14C-CGA-362622 when foliar-applied to green and false-green kyllinga. Technical grade radiolabeled halosulfuron and CGA-362622 were obtained for these experiments. C14-herbicide was applied (580 bq/μl + 0.25% NIS) in five μL droplets to the upper surface of a single leaf of green and false-green kyllinga plants. Plants were then harvested at distinct time intervals from 4 to 96 hrs. At harvest, plants were divided into four plant parts: Leaf treated with C14-herbicide, primary shoot that contained the treated leaf, roots, and rhizomes. To determine total absorption, the treated leaf was washed to remove non-absorbed C14-herbicide and the amount of C14 in the rinsate was quantified. To determine total herbicide translocation throughout the plant, all plants parts were combusted in a biological oxidizer, C14 molecules were captured, and the amount captured from each plant part was quantified. To determine total herbicide metabolism over time, additional divided plants were ground with a mortar and pestle to remove cellular contents, captured homogenate was spotted on thin-layer chromatography (TLC) plates, developed, and chemical metabolites were quantified. A C14 herbicide standard was used to locate the parent compounds of CGA-362622 and halosulfuron on each TLC plate. No differences were observed between the two Kyllinga spp. with regards to absorption, translocation, or metabolism of either herbicide. The majority of 14C-halosulfuron and 14C-CGA-362622 as absorbed by 4h, with an accumulation of 63 and 47% radioactivity, respectively. Accumulation of both herbicides occurred in the treated leaf and the primary shoot from whence the treated leaf was removed, with minor accumulation occurring in the roots and newly formed rhizomes. Of the total amount of 14C-halosulfuron absorbed into the plant, 77% remained in the form of the parent compound compared to 61% of 14C-CGA-362622. The parent compound was distributed mainly in the treated leaf and primary shoot, while polar metabolites were concentrated in the roots and rhizomes. Non-polar metabolites of 14C-CGA-362622 accumulated in the treated leaf and primary shoot. These data indicate that absorption, translocation, or metabolism could not explain the variation in green and false-green kyllinga control between halosulfuron and CGA-362622." |
Language: | English |
References: | 0 |
Note: | "The changing world of weed science" This item is an abstract only! |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): McElroy, J. S., F. H. Yelverton, I. C. Burke, and J. W. Wilcut. 2004. Absorption, tranloscation, and metabolism of CGA-362622 and halosulfuron in green and false-green kyllinga. South. Weed Sci. Soc. Proc. 57:p. 211. |
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| Web URL(s): http://www.swss.ws/wp-content/uploads/docs/2004%20Proceedings-SWSS.pdf#page=309 Last checked: 07/17/2013 Requires: PDF Reader Notes: Item is within a single large file |
| MSU catalog number: b2207931 |
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