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| Web URL(s): | http://www.newss.org/proceedings/proceedings_2008.pdf#page=72
Last checked: 07/16/2013
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Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Dernoeden, P. H.;
Fu, J. |
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| Author Affiliation: | University of Maryland, College Park |
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| Title: | Postemergence smooth crabgrass and white clover control with mesotrione |
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| Section: | Turfgrass and plant growth regulators I
Other records with the "Turfgrass and plant growth regulators I" Section
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| Meeting Info.: | Philadelphia, Pennsylvania: January 7-10, 2008 |
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| Source: | Proceedings of the Sixty-Second Annual Meeting of the Northeastern Weed Science Society. Vol. 62, 2008, p. 54. |
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| Publishing Information: | Baltimore, Maryland: Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Crabgrass control; Digitaria ischaemum; Herbicide efficacy; Herbicide evaluation; Mesotrione; Postemergence weed control; Trifolium repens
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| Abstract/Contents: | "Smooth crabgrass (Digitaria ischaemum) and white clover (Trifolium repens) are among the most common and invasive turf weeds. Mesotrione has broad-spectrum activity on diverse weed species, but effective use rates and timings for postemergence crabgrass and white clover control in summer has not been established in Maryland. In the crabgrass study, various herbicide rates we reapplied once or twice in two timings as follows: mid-post when crabgrass was in the 4-leaf to 2-tiller stage (28 June; sequential 12 July 2007) and late-post when crabgrass was in the 3- to 8-tiller stage (18 July; sequential 1 August 2007). In the white clover study, mesotrione was applied three times beginning 28 June 2007. Fenoxaprop and quinclorac were applied as standards. Mesotrione and quinclorac were tank-mixed wit h 0.25% v/v X-77 nonionic surfactant and 1% v/v methylated seed oil, respectively. Herbicides were applied in 50 GPA using a CO2 pressurized (35 psi) sprayer equipped with an 8004 flat fan nozzle. The study areas were irrigated within 48 hrs of each application and thereafter to prevent drought stress. Soil was a Keyport silt loam with a pH of about 5.7 and 2.2% OM. Plots were 5 ft x 5 ft and were arranged in a randomized complete block (crabgrass study) or were completely randomized (white clover study) with four replications. Tall fescue (Festuca arundinacea) color and percent of plot area covered by crabgrass and white clover were assessed visually. Crabgrass and white clover pressure were uniform and severe across the sites. Data were subjected to the analysis of variance and significantly different means were separated at Pā¤0.05 using Fisher's least significant difference test. Treatments providing commercially acceptable crabgrass control (i.e., < 5% cover) by 31 August 2007 included: mesotrione applied at 0.250+0.250 lb ai/A mid- and late-post and fenoxaprop (0.125+0.125 lb ai/A) and quinclorac (0.5+0.5 lb ai/A) applied late-post. Treatments providing statistically equivalent control to the aforementioned were: mesotrione applied at 0.187+0.187 lb ai/A mid-and late-post (8% crabgrass cover); mesotrione applied at 0.125+0.125 lb ai/A late-post (19% crabgrass cover); and fenoxaprop (0.09 lb ai/A) and quinclorac (0.75 lb ai/A) in the mid-post timing (14-15% crabgrass cover). Mesotrione (0.250 lb ai/A ) applied once performed better in the mid-post versus the late-post timing. Data indicated that the lowest effective rate of mesotrione in a sequential application, given the conditions of t he study, was 0.187+0.187 lb ai/A. Mesotrione elicited an objectionable level of chlorosis in tall fescue for about 20 days. Mesotrione slowly reduced white clover cover following two applications on 28 June and 12 July, but the level of control was unacceptable. Following a third application on 1 August, plots treated with 0.125, 0.187 and 0.250 lb ai/A mesotrione had white clover cover ratings ranging from 0 to 6%, which were statistically equivalent to white clover levels in plots treated once with quinclorac at 0.75 lb ai/A on 28 June (1% white clover cover)." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., and J. Fu. 2008. Postemergence smooth crabgrass and white clover control with mesotrione. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 62:p. 54. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_2008.pdf#page=72
Last checked: 07/16/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 |
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