Full TGIF Record # 233615
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Web URL(s):https://web.archive.org/web/20160212125339/http://www.turfgrasssociety.eu/home/articles/code/429?headline=Strategies%20for%20Controlling%20Annual%20Bluegrass%20%28Poa%20annua%20L.%29%20Using%20HPPD-Inhibiting%20Herbicides%20Applied%20with%20Urea-N%20Fertilizer
    Last checked: 04/15/2016
Publication Type:
Author(s):Elmore, M. T.; Brosnan, J. T.; Breeden, G. K.
Title:Strategies for controlling annual bluegrass (Poa annua L.) using HPPD-inhibiting herbicides applied with urea-N fertilizer
Meeting Info.:Kristiansand, Norway: June 24-26, 2012
Source:3rd European Turfgrass Society Conference Proceedings. Vol. 3, 2012, p. Unknown.
# of Pages:0
Publishing Information:Angers, France: European Turfgrass Society
Keywords:TIC Keywords: Application rates; Combination treatments; Digitaria ischaemum; Herbicide efficacy; Herbicide evaluation; Mesotrione; Nitrogen fertilization; Poa annua control; Topramezone
Abstract/Contents:"Few options for selective control of annual bluegrass (Poa annua) in cool-season turfgrass exist. Mesotrione is a hyrdoxyphenylpyruvate dioxygenase- (HPPD) inhibiting herbicide labeled for use in cool-season turfgrass. Published data indicate mesotrione control of annual bluegrass is inconsistent. Research at the University of Tennessee demonstrated that applying nitrogen (N) fertilizer in conjunction with mesotrione improves control of smooth crabgrass (Digitaria ischaemum Schreb.). Greenhouse trials were conducted in 2011 at the University of Tennessee to determine if N fertilizer would enhance efficacy of mesotrione and the HPPD-inhibitor topramezone against annual bluegrass. Field trials were conducted also conducted in 2011 to evaluate single and sequential applications of mesotrione for annual bluegrass control. For greenhouse experiments, individual tillers of annual bluegrass were collected from the East Tennessee Research and Education Center in Knoxville, TN and transplanted to cone-tainers and allowed to grow for 4 weeks in a peat moss growing medium. Treatments were arranged in a two-by-two factorial with single applications of mesotrione (280 g ha-1) and topramezone (14.5 g ha-1) applied with two rates (0 and 49 kg ha-1) of N fertilizer derived from urea (46-0-0). Treatments were replicated 10 times and were compared to an untreated and nitrogen-treated control. Herbicide treatments were applied with NIS at 0.25% v/v using a spray chamber. Annual bluegrass was evaluated visually on a 0 (no control) to 100% (complete control) scale and using chlorophyll fluorescence yield (Fv/Fm) at 3, 5, 7, 14 and 21 days after treatment (DAT). Aboveground dry biomass was determined 21 DAT. A field experiment was conducted on a bermudagrass fairway overseeded with perennial ryegrass in Rockford, TN in early 2011. Treatments consisted one or two applications of mesotrione at 280 g ha-1, and one, two or three applications of mesotrione at 175 g ha-1. Repeat applications were made on 14-day intervals. Herbicide treatments were applied with NIS at 0.25% v/v using standard small-plot spray equipment. Comparisons were made to an untreated-control and bispyribac-sodium (74 g ha-1). Treatments were evaluated 7, 14, 21, 28, 42 and 56 days after initial treatment (DAIT). Grid counts were conducted 56 DAIT. In greenhouse experiments, N increased visual control of mesotrione at 14 DAT only. Mesotrione reduced dry biomass compared to the untreated similarly for both N rates. Topramezone-treated plants did not differ from untreated plants for any method of evaluation on any date. In field experiments, all treatments provided > 66% control of annual bluegrass 56 DAIT. When mesotrione was applied at 280 g ha-1, two applications provided better control than one. When applied at 175 g ha-1, three applications of mesotrione provided better control than one application; control from two applications was not different from one or three applications. This research indicates that mesotrione but not topramezone can provide control of annual bluegrass. The effect of N on control of annual bluegrass with mesotrione needs to be investigated further. Multiple applications of mesotrione provide better control than single applications."
Note:Summary appears as abstract
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Elmore, M. T., J. T. Brosnan, and G. K. Breeden. 2012. Strategies for controlling annual bluegrass (Poa annua L.) using HPPD-inhibiting herbicides applied with urea-N fertilizer. Eur. Turfgrass Soc. Conf. Proc. 3:p. Unknown.
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    Last checked: 04/15/2016
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