Full TGIF Record # 81586
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Web URL(s):http://www.newss.org/proceedings/proceedings_2002_vol56.pdf#page=132
    Last checked: 07/24/2013
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Content Type:Abstract or Summary only
Author(s):Dernoeden, P. H.; Kaminski, J. E.; Krouse, J. M.
Author Affiliation:Department of Natural Resource Sciences & LA, University of Maryland, College Park, MD
Title:Smooth crabgrass control and safeners for quinclorac use on creeping bentgrass
Meeting Info.:Loews Hotel, Philadelphia, PA: January 7, 8, 9, and 10, 2002
Source:Proceedings of the 56th Annual Meeting of the NortheasternWeed Science Society. Vol. 56, 2002, p. 132.
Publishing Information:Ithaca, NY: Northeastern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Digitaria ischaemum; Weed control; Quinclorac; Agrostis stolonifera; Application rates; Application timing; Urea; Crabgrass control; Iron chelates; Micronutrients; Turf discoloration; Lolium perenne; Herbicide injury
Cultivar Names:Crenshaw
Trade Names:Lesco's 12-0-0 Chelated Iron Plus Micronutrients
Abstract/Contents:"Previous research conducted at the Univ. of Maryland suggested that multiple applications of quinclorac were more consistent in controlling smooth crabgrass (Digitaria ischaemum [Schreb.] Screb.ex.Muhl). The aforementioned study also demonstrated that quinclorac elicited a chlorosis in creeping bentgrass (Agrostis palustris) that persisted for numerous weeks. Herbicide injury to bentgrass turf sometimes can be ameliorated by nitrogen (N) and iron (Fe). There were two objectives of this field study as follows: 1) to fine-tune the rates and timings of quinclorac applications for crabgrass control and 2) to determine if urea or a chelated iron plus micronutrient product would mask discoloration elicited by quinclorac applied to bentgrass. For the safener study, turf was a 2 yr old stand of Crenshaw creeping bentgrass. Turf was mowed to a height of 0.60 inches three times weekly. There were two adjacent perennial ryegrass (Lolium perenne) sites for the smooth crabgrass control study. One site had extremely high levels of crabgrass and the second site had moderate levels. Quinclorac was tank-mixed with methylated seed oil (1.0% v/v) and applied in 50 gpa using a CO2 pressurized (35 psi) sprayer. Plots were 5 ft x 5 ft and arranged in a randomized complete block with four replications. Creeping bentgrass color and quality were rated visually on a 0 to 10 scale were 0=turf brown and10=optimum greenness. Crabgrass cover was rated on a 0 to 100% linear scale, and cover ratings exceeding 5% were considered to be commercially unacceptable. Data were subjected to the analysis of variance and significantly different means were separated by the least significant difference t-test at P = 0.05. Urea and Lesco's 12-0-0 Chelated Iron Plus Micronutrients® (Fe + N) were evaluated for their ability to mask or safen the injurious effect of quinclorac. Urea (0.125 lb N/1000ft2) and Fe , N (0.044 lb N plus 0.022 lb of FeSO4 per 1000ft2) were tank-mixed with each quinclorac treatment. Sequential quinclorac applications were applied on 2 wk intervals beginning 28 June 2001 at the same rates described below in the control study. Quinclorac discolored and reduced bentgrass quality for numerous weeks, particularly sequentially-treated turf. Tank-mixing quinclorac with Fe + N was much more effective in ameliorating herbicide injury than urea. On most rating dates, bentgrass color and quality were in the acceptable range when quinclorac was tank-mixed with Fe + N. Two adjacent ryegrass sites containing either extremely severe or moderate levels of crabgrass were assessed. Quinclorac treatments were 0.75, 0.5 + 0.5, 0.33 + 0.33 + 0.33, 0.25 + 0.25 + 0.25 + 0.25 lb/A. There were three application timings as followed: early postemergence (EPO) treatments were initiated on 31 May 2001 when crabgrass was in the 1 to 4 leaf stage; midpostemergence (MPS) treatments were initiated on 28 June when crabgrass was in the 1 to 4 leaf stage; mid-postemergence (MPO) treatments were initiated on 28 June when crabgrass was in the 4-leaf to 3 tiller stage, and late postemergence (LPO) treatments were initiated on 25 July when crabgrass had 2-8 tillers. For the severe site, 0.5 + 0.5, 0.25 + 0.25 + 0.25 + 0.25 and 0.33 + 0.33 + 0.33 lb/A sequentials provided the best control in the EPO timing. All MPO treatments resulted in unacceptable control in the severe site, and only 0.25 lb/A sequentials applied in the LPO timing provided good control. In the moderate crabgrass pressure site all treatments except 0.75 lb/A applied LPO provided acceptable control."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., J. E. Kaminski, and J. M. Krouse. 2002. Smooth crabgrass control and safeners for quinclorac use on creeping bentgrass. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 56:p. 132.
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http://www.newss.org/proceedings/proceedings_2002_vol56.pdf#page=132
    Last checked: 07/24/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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