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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2006 Proceedings-SWSS.pdf#page=300
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Publication Type:
i
Report
Author(s):Walker, R. H.
Author Affiliation:Alabama Agric. Exp. Stn., Auburn University, Auburn University, AL
Title:Root and foliar uptake of sulfonylurea herbicides
Section:Symposia - weed management in turf with sulfonylurea herbicides
Other records with the "Symposia - weed management in turf with sulfonylurea herbicides" Section
Meeting Info.:San Antonio, Texas: January 23-25, 2006
Source:Proceedings: Southern Weed Science Society 59th Annual Meeting. Vol. 59, 2006, p. 228.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Foliar uptake; Herbicide efficacy; Herbicide evaluation; Sulfonylurea herbicides; Weed control
Abstract/Contents:"Herbicides classified as sulfonylureas (SU) are used to control a broad spectrum of grass, broadleaf and sedge species in turf. All are applied postemergence (POST) but can provide some preemergence (PRE) activity. It is commonly known that weeds have a propensity to develop resistance to SU- and other ALS-inhibiting compounds. Therefore, understanding root and/or foliage absorption by weed species should help in developing usages that will allow for maximum efficacy and thus potential to prevent weed resistance. After reviewing the literature, it can be concluded that SU herbicides are absorbed by both root and foliage of plants. Ambi-mobile translocation patterns in plants are usually observed. However, absorption varies among SU herbicides and weed species. In earlier research Leys and Slife (1988) reported chlorsulfuron and metsulfuron reduced wild garlic (ALLVI) shoot dry weight, height, and number of leaves more when applied to the foliage or to both the foliage and the soil, than when they were applied to the soil alone. Baird et al. (1989) reported sulfometuron was absorbed by the roots and foliage of centipedegrass (ERLOP) and bahiagrass (PASNO); extent of which was not characterized. More recently in selective placement studies with rimsulfuron, Wehtje and Walker conclude that Poa annua var. annua (POAAN) was equally controlled with foliar+soil and soil-only applications. However, with var. reptans, foliar+soil was the most effective exposure but soil only was still significantly better than foliar only. In subsequent studies with POAAN control with rimsulfuron, trifloxysulfuron, and foramsulfuron they showed identical results with rimsulfuron. Best control with trifloxysulfuron and foramsulfuron was foliar+soil applications. However, trifloxysulfuron was equally absorbed by root and foliage whereas foramsulfuron showed only minor root absorption from soil-only applications. The same experiment was conducted with goosegrass (ELEIN). Control was best with all three herbicides with foliar+soil application. Again, foliar absorption with foramsulfuron was far more important than root absorption. Importance of root and shoot absorption with rimsulfuron and trifloxysulfuron could not be determined since efficacy against ELEIN with these herbicides was low. Williams et al. at examined the importance of selective placement of trifloxysulfuron for control of torpedograss (PANRE). Foliar+soil and soil only were more effective than foliar only in suppressing regrowth at 10 wk after treatment. They concluded that soil-only application followed by root entry was more effective in delivering phytotoxic concentrations to the regenerative tissues of PANRE than foliar only. Wehtje et al. conducted selective placement studies with halosulfuron for control of eclipta (ECLPZ) in container-grown ornamentals. They concluded that control was a product of foliar and root entry, with foliar being of greater importance. McElroy et al. conducted selective placement studies with trifloxysulfuron and halosulfuron for control of green kyllinga (KYLBR). Shoot number reduction with soil+foliar, foliar-only and soil-only application of trifloxysulfuron was 99, 2 and 40%, respectively. With halosulfuron, reductions were 67, 7 and 22%, respectively. McElroy et al. also evaluated selective exposure of yellow (CYPES) and purple (CYPRO) nutsedges to trifloxysulfuron, imazaquin, MSMA and imazaquin + MSMA. Soil-applied trifloxysulfuron reduced shoot number, shoot weight and root weight greater than foliar applied. Averaged over herbicide treatments, soil-applied treatments were more effective in reducing CYPRO shoot number, whereas foliar applied were more effective in reducing CYPES shoot number."
Language:English
References:0
Note:"Vision for the future"
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Walker, R. H. 2006. Root and foliar uptake of sulfonylurea herbicides. South. Weed Sci. Soc. Proc. 59:p. 228.
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http://www.swss.ws/wp-content/uploads/docs/2006 Proceedings-SWSS.pdf#page=300
    Last checked: 07/18/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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