Full TGIF Record # 65375
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Web URL(s):http://www.newss.org/proceedings/proceedings_2000_vol54.pdf#page=114
    Last checked: 07/24/2013
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Report
Author(s):Dernoeden, P. H.; Krouse, J. M.
Author Affiliation:Dernoeden: Professor, Department of Natural Resource Sciences and Landscape Architecture, University of Maryland, College Park, MD; Krouse: Research Associate, Department of Natural Resource Sciences and Landscape Architecture, University of Maryland, College Park, MD
Title:Postemergence smooth crabgrass control evaluations in Maryland, 1998-1999
Section:Turfgrass and plant growth regulators
Other records with the "Turfgrass and plant growth regulators" Section
Meeting Info.:Baltimore, MD: January 3-6, 2000
Source:Proceedings of the 54th Annual Meeting of the Northeastern Weed Science Society. Vol. 54, 2000, p. 114.
Publishing Information:College Park, MD: Northeastern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Herbicide evaluation; Postemergence weed control; Digitaria ischaemum; Crabgrass control; Lolium perenne; Fenoxaprop-ethyl; MSMA; Ethofumesate; Comparisons; Application timing; Tank mix
Geographic Terms:Maryland
Abstract/Contents:"Three studies were conducted to evaluate herbicides for postemergence smooth crabgrass (Digitaria ischaemum [Schreb.] Muhl.) control in mature stands of perennial ryegrass (Lolium perenne). The objectives of the three studies were as follows: I) to assess Acclaim Extra (fenoxaprop) and Daconate 6 (MSMA) tank-mixes as a possible resistance management strategy for crabgrass; II) to compare the crabgrass control effectiveness of Acclaim Extra and Drive (quinclorac) to PreClaim (fenoxaprop + pendimethalin) applied in early and mid-postemergence application timings; and III) to compare multiple, low rate, application timings of Acclaim, Acclaim Extra, and Prograss (ethofumesate) for crabgrass control efficacy. Drive was tank-mixed with methylated seed oil (1% v/v) in all studies. Herbicides were applied in 50 gpa with a CO₂ pressurized (35 psi) backpack sprayer equipped with an 8004E Tee Jet nozzle. All sites were irrigated 24 hours prior to each herbicide application and thereafter to prevent wilting of the turf. Plots were 5 by 5 feet and were arranged in a randomized complete block with four replicates. Percent of plot area covered with crabgrass was assessed in mid-to-late August using a visual 0 to 100% linear scale where 0 = no crabgrass and 100 = entire plot area covered with crabgrass. Data were subjected to analyses of variance and significantly different means were separated by the least significant t-test (P=0.05). In study I, there were two application regimes: 1) sequential applications at 1-2 leaf (L) + tillering (T) stages, and 2) a single spplication at tillering. Data showed that only pots treated sequentially with Acclaim Extra alone (0.04 lb ai/A = lb/A; 1-2 L + T) provided excellent control (<4% crabgrass cover). Good control (<10% crabgrass cover) was provided by the sequential, Acclaim Extra + Daconate 6 (0.04 + 0.5 lb/A) treatment. The high rate of Daconate 6 (1.0 lb/A) tank mized with Acclaim Extra (0.04 or 0.09 lb/A) appeared to have antagonized Acclaim Extra in both regimes (31-85% crabgrass cover). Extremely poor control was provided by Daconate 6 alone (1.0 lb/A) and Drive (0.75% lb/A)(85 and 21% crabgrass cover, respectively). In study II, there were three application timings: 1) early post (1-4 L); mid-post (1-2 T); and late-post (≥ 3 T). Drive (0.75 lb/A) provide [provided] poor control in the early and late post timings (44-66% crabgrass cover), but gave fair control when applied in the mid-post timing (15% crabgrass cover). PreClaim (1.54 and 2.06 lb/A) applied in the early postemergence timing proved unacceptable control (11 - 13% crabgrass cover), but Preclaim (2.06 lb/A) applied in the mid-post timing gave excellent (2% crabgrass cover) control. Acclaim Extra (0.09 or 0.12 lb/A) and Puma (fenoxaprop, 0.09 lb/A) also gave commercially aceptable control (1 - 5% crabgrass cover) when applied in either the mid-or-late postemergence timings. In study III, Acclaim Extra 0.57EW 0.016 and 0.020 lb/A), Acclaim 1EC (0.031 lb/A), and Prograss (0.75 lb/A) were applied on either a 14 or 21-day interval beginning when crabgrass was in the 1-2 L stage. Except for Prograss (15% crabgrass cover), all treatments provided outstanding crabgrass control (0-3%). There was no difference in the level of control provided by Acclaim of Acclaim Extra applied on either the 14 or 21-day spray interval schedule."
Language:English
References:0
See Also:Other items relating to: M S M A
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., and J. M. Krouse. 2000. Postemergence smooth crabgrass control evaluations in Maryland, 1998-1999. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 54:p. 114.
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Web URL(s):
http://www.newss.org/proceedings/proceedings_2000_vol54.pdf#page=114
    Last checked: 07/24/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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