Full TGIF Record # 224885
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Web URL(s):http://newss.org/proceedings/proceedings_2009.pdf#page=28
    Last checked: 07/17/2013
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Publication Type:
i
Report
Author(s):Roten, R. L.; Richardson, R. J.; Gardner, A. P.
Author Affiliation:North Carolina State University, Raleigh
Title:Turfgrass response to herbicide treated irrigation water
Section:Research posters
Other records with the "Research posters" Section
Meeting Info.:Baltimore, Maryland: January 6-8, 2009
Source:Proceedings of the Sixty-Third Annual Meeting of the Northeastern Weed Science Society. Vol. 63, 2009, p. 13.
Publishing Information:Baltimore, Maryland: Northeastern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Agrostis stolonifera; Atrazine; Cynodon dactylon; Diuron; Festuca arundinacea; Glyphosate; Herbicide evaluation; Imazamox; Imazapyr; Irrigation water; Zoysia
Abstract/Contents:"North Carolina has approximately 2.2 million acres of turfgrass with high demand for reliable sources of irrigation water. Ponds are frequent irrigation sources, but they may become infested with aquatic weeds and require herbicide treatment. This herbicide treatment often interferes with the ability to irrigate. Therefore, research was conducted with bermudagrass [Cynodon dactylon (L.) Pers.], creeping bentgrass (Agrostis palustris Huds.), tall fescue (Festuca arundinacea Schreb.), and zoysiagrass (Zoysia spp.) to evaluate the impacts of herbicides in irrigation water on turfgrass response. Sod was dug from a commercial farm and transplanted into 4" pots at the NCSU greenhouses using sandy clay loam as a potting medium. Turfgrass was allowed to establish in pots for at least one month prior to treatment. Herbicide treatments included atrazine (141 to 9000 ppb), diquat (71 to 4500 ppb), diuron (141 to 9000 ppb), glyphosate (71 to 4500 ppb), imazamox (35 to 2250 ppb), and imazapyr (35 to 2250 ppb), each applied at seven rates. A non-treated control was included for comparison. Atrazine and diuron are not registered for aquatic use, but were included due to frequent off-label use of diuron and potential for off-site atrazine movement. Herbicides were applied twice by hand with appropriate water volume to simulate 0.5 inch of irrigation. Digital images of each treatment were collected for visual documentation. Turf injury was visually rated on a weekly basis using a scale of 0% (no injury) to 100% (plant death). Trials were evaluated once a week for a total of 4 weeks after trial initiation. Regression curves were created based on the visual rating data. Based on these curves, the concentration of each herbicide required to cause 20% injury to each turf species were calculated. Turfgrass species demonstrated high tolerance to applications of diquat and glyphosate with little injury. Imazamox at 2,250 ppb resulted in 20% injury to bermudagrass and imazapyr produced 35% injury at 563 ppb and increased to 50% at 2,250 ppb. Creeping bentgrass injury increased with increasing rates of atrazine and diuron. Injury from atrazine was 23% with 1125 ppb and nearly 100% with 4,500 and 9,000 ppb. Diuron at 4,500 ppb resulted in 28% injury. Tall fescue was the most sensitive to injury among the grasses treated. Injury at 20% or greater was inflicted with each herbicide with the exception of glyphosate. The greatest level of injury was observed with atrazine and diuron with injury exceeding 90% at 2,250 ppb and 4,500 ppb respectively. Injury exceeded 45% with imazapyr at 2,250 ppb. Injury to zoysiagrass was minimal with less than 20% injury at all rates of atrazine, diquat, diuron, glyphosate, and imazapyr. In conclusion, all registered aquatic herbicides evaluated had an appropriate margin of safety based on the recommended use pattern."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Roten, R. L., R. J. Richardson, and A. P. Gardner. 2009. Turfgrass response to herbicide treated irrigation water. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 63:p. 13.
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http://newss.org/proceedings/proceedings_2009.pdf#page=28
    Last checked: 07/17/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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