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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2012 Proceedings-SWSS.pdf#page=87
    Last checked: 08/07/2013
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Author(s):Lewis, D. F.; Yelverton, F. H.
Author Affiliation:North Carolina State University, Raleigh, NC
Title:Recycling synthetic auxin treated turfgrass clippings for additional weed control
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Meeting Info.:Charleston, South Carolina: January 23-25, 2012
Source:2012 Proceedings, Southern Weed Science Society. Vol. 65, 2012, p. 15.
# of Pages:1
Publishing Information:Champaign, Illinois: Southern Weed Science Society
Keywords:TIC Keywords: Clipping utilization; Herbicide injury; Recycling; Auxins; Weed control
Abstract/Contents:"Synthetic auxin herbicides are utilized for controlling various broadleaf weeds in turfgrass settings. Aminocyclopyrachlor (AMCP) is a newly registered pyrimidine carboxylic acid with a similar chemical mode-of-action and structure to clopyralid. Off-target plant injury has occurred following exposure to compost containing turfgrass clippings previously treated with CLPY. Due to this issue, AMCP and CLPY labels suggest all treated turfgrass clippings be returned following a mowing event. However, large quantities of turfgrass clippings can accumulate if regular mowing practices are not followed. Furthermore, clippings are undesirable in golf course, athletic field, and home lawn turf systems because they can interfere with playability and aesthetics. Therefore, alternative uses for synthetic auxin-treated turfgrass clippings are needed. Research was conducted in 2011 at the North Carolina State University Turfgrass Field Lab in Raleigh, NC to determine the efficacy of recycling AMCP and CLPY treated turfgrass clippings for white clover (Trifolium repens L.) control in common bermudagrass [Cynodon dactylon (L.) Pers.] utility turf. AMCP [Imprelis™ (79 g ae ha-1)] and CLPY [Lontrel® (79 g ha-1)] were applied to mature tall fescue [Lolium arundinaceum (Schreb.) S.J. Darbyshire] 56, 28, 14, 7, 3, and 1 days before clipping collection (DBC). CLPY rate was less than label recommendation but selected for an equal active ingredient comparison to AMCP. Following collection, previously treated tall fescue [454 g clippings (fresh weight) plot-1 (1 m x 1.5 m)] was applied to a white clover/bermudagrass stand. Experimental design was a randomized complete block in a 2x6 factorial arrangement (two herbicides by six clipping collection timings) with four replications and two experimental runs. Visual white clover control and NDVI were recorded over the duration of the experiment. At 8 weeks after initiation (WAI), white clover was harvested to record biomass. Data were subject to ANOVA conducted using MIXED model methodology. ANOVA indicated a significant interaction between main effects of herbicide and clipping collection timings. Means were separated using Fisher's Protected LSD (P<=0.05) and linearly regressed to illustrate the relationship of herbicide and clipping collection timing. For brevity, only results from 8 WAI are reported. AMCP-treated tall fescue provided greater white clover control than CLPY-treated turf at 28, 14, 7, 3, and 1 DBC. White clover control from AMCP-treated tall fescue followed a linear regression pattern (r2=0.91), ranging from 16% control 56 DBC to >80% control <=7 DBC. CLPY-treated turf did not demonstrate a linear pattern, with white clover control not exceeding 40% from any DBC timings. White clover NDVI values were less from tall fescue previously treated with AMCP 14, 7, 3, and 1 DBC compared to CLPY applied at the same timings. NDVI decreased in a linear pattern (r2 =0.83) from AMCP-treated turf but did not follow the same linear pattern from CLPY-treated turf. No differences in NDVI value were detected from CLPY-treated tall fescue from 56 to 1 DBC. Regarding white clover dry biomass, tall fescue applied with AMCP 14, 7, 3, and 1 DBC resulted in less biomass than CLPY applied at the same timings. Dry weight decreased linearly (r2 =0.84) as AMCP-applications went from 56 DBC (114 g) to 1 DBC (48g). Dry biomass from CLPY-applied turf did not follow a linear pattern, as values ranged 24 g from 56 DBC (96 g) to 1 DBC (120 g). These data indicate recycling synthetic auxin treated turfgrass clippings could provide additional weed control. However, turfgrass managers must be proactive in properly recycling treated turfgrass clippings in a manner which avoids potential off-target injury to nontargeted plant species."
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Lewis, D. F., and F. H. Yelverton. 2012. Recycling synthetic auxin treated turfgrass clippings for additional weed control. South. Weed Sci. Soc. Proc. 65:p. 15.
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http://www.swss.ws/wp-content/uploads/docs/2012 Proceedings-SWSS.pdf#page=87
    Last checked: 08/07/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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