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| Web URL(s): | http://www.newss.org/proceedings/proceedings_2004_vol58.pdf#page=119
Last checked: 07/23/2013
Requires: PDF Reader
Notes: Item is within a singel large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Dernoeden, P. H.;
Kaminski, J. E.;
McDonald, S. J. |
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| Author Affiliation: | University of Maryland, College Park, Maryland |
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| Title: | Preemergence smooth crabgrass and postemergence annual bluegrass control in turfgrass |
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| Section: | Turfgrass and plant growth regulators section
Other records with the "Turfgrass and plant growth regulators section" Section
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| Meeting Info.: | Marriott Cambridge Center, Cambridge, Massachusetts: January 5-8, 2004 |
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| Source: | Proceedings: Northeastern Weed Science Society. Vol. 58, 2004, p. 119-120. |
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| Publishing Information: | Ithaca, NY: Northeastern Weed Science Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Crabgrass control; Digitaria ischaemum; Herbicide efficacy; Herbicide evaluation; Herbicide trials; Poa annua control; Postemergence weed control; Preemergence weed control
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| Abstract/Contents: | "Two field studies were conducted to evaluate herbicides for annual bluegrass (Poa annua) and smooth crabgrass (Digitaria ischaemum) control. The annual bluegrass study was conducted on a bentgrass (Agrostis stolonifera) fairway at Norbeck C.C., Rockville, MD, where soil was a silt loam with a pH of 5.4 and 7.0% organic matter (OM). The crabgrass study was conducted in a perennial ryegrass (Lolium perenne) turf at the University of Maryland Paint Branch Turfgrass Research Facility in College Park, where soil was a silt loam with a pH of 5.9 and 3.4% OM. Dates and rates for crabgrass herbicide applications appear in the data table. In both studies, herbicides were applied in 50 GPA using a CO2 pressurized (35 PSI) backpack sprayer equipped with an 8004E nozzle. Plots in both studies were 5 ft by 5 ft and arranged in a randomized complete block with four replications. Percent of plot area covered with smooth crabgrass or annual bluegrass was assessed visually on a 0 to 100% linear scale. Data were subjected to ANOVA and significantly different means were separated by the Fisher's Protected LSD test at P = 0.05. Preemergence herbicide treatments were initiated on 28 March and the first crabgrass seedlings were observed 14 April 2003. Germination levels were low in April and May due to unseasonably cool and wet weather. During the study period there were numerous rain events, which stimulated crabgrass germination as late as August. The slow spring development of crabgrass was evident on 18 July, when only trace levels of crabgrass were observed in most herbicide-treated plots. An exception was Pendulum (pendimethalin) 3.3EC (both rates), which provided no crabgrass control. Many crabgrass plants were small and could not be detected in the turf canopy at this time. Warmer weather prevailed thereafter and crabgrass plants tillered and became more vigorous. By 18 August, most treated plots exceeded 10% crabgrass cover. Only plots treated with Barricade 4F (prodiamine; 0.50 plus 0.25 lb/A), Barricade 65DG (0.50 plus 0.25 lb/A), L-0441, L-0442, and L-0445 had ratings of 40% crabgrass cover) was observed in plots treated with Pendulum 3.8CS (1.5 plus 1.5 lb/A), L-0444, L-0447, Dimension 2EW (dithiopyr; 0.5 lb/A) and Dimension Ultra (0.5 lb/A). The highest level of control was provided by Barricade 4F (0.5 plus 0.25 lb/A) and Barricade 65DG (0.5 plus 0.25 lb/A). Plots treated with sequential applications of Dimension Ultra (0.25 plus 0.25) and L-0441, L-0442, and L-0445, which were applied only once, had crabgrass levels statistically equivalent to the aforementioned sequential treatments. Evidently, the excessive rainfall had contributed to a more rapid degradation of the herbicides than occurs in an average year. Velocity (bispyribac-sodium) was assessed for postemergence annual bluegrass (ABG) control in two application timings beginning on either 14 May (Timing I) or 16 July (Timing II). These were four treatments as follows: 30 gr ai/A; 30 gr ai/A applied 14 and 28 May and 12 June (Timing I) or 30 gr ai/A applied 16 and 30 July (Timing II); 45 gr ai/A; and 60 gr ai/A. Annual bluegrass levels initially ranged from 10 to 30% across the site. Velocity treatments, regardless of rate, elicited a brilliant chlorosis in both species for about two weeks. The yellowing was so uniform it was difficult to visibly distinguish ABG from bentgrass. Velocity-treated plots exhibited little if any loss of density and turf regained its normal color. Plots were rated for ABG cover on 13 October and the ABG levels were lower than when the study was initiated in May. Velocity applied at 30 plus 30 gr ai/A in Timing II was the only treatment that reduced ABG cover (4.3% ABG) significantly, when compared to the nontreated control (12.0% ABG). In Timing II, there were no significant differences among all four treatments and ABG cover ranged from 4.3 to 7.5% in Velocity-treated plots." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract, with table, only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., J. E. Kaminski, and S. J. McDonald. 2004. Preemergence smooth crabgrass and postemergence annual bluegrass control in turfgrass. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 58:p. 119-120. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_2004_vol58.pdf#page=119
Last checked: 07/23/2013
Requires: PDF Reader
Notes: Item is within a singel large file |
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MSU catalog number: SB 610 .N62 v. 57 |
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