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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1993_vol47.pdf#page=91
Last checked: 07/24/2013
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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): | Fidanza, M. A.;
Dernoeden, P. H. |
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| Author Affiliation: | Fidana: Graduate Research Assistant; and Dernoeden: Professor, Department of Agronomy, University of Maryland, College Park, MD |
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| Title: | Evaluation of preemergence herbicides for smooth crabgrass control in Maryland, 1992 |
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| Section: | Turfgrass and plant growth regulators - Wednesday January 6
Other records with the "Turfgrass and plant growth regulators - Wednesday January 6" Section
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| Meeting Info.: | Baltimore, MD: January 4-7, 1993 |
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| Source: | Proceedings of the 47th Annual Meeting of the Northeastern Weed Science Society. Vol. 47, 1993, p. 91-92. |
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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: Herbicides; Herbicide evaluation; Preemergence herbicides; Poa pratensis; Digitaria ischaemum; Crabgrass control; Weed control; Experimental products; Formulations; Application rates; Application timing
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| Cultivar Names: | Fylking; Kenblue |
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| Geographic Terms: | Maryland |
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| Abstract/Contents: | "Three studies were conducted to evaluate commercial and experimental herbicides for their preemergence control efficacy of smooth crabgrass [Digitaria ischaemum (Schreb.) Muhl.]. The products and rates evaluated and dates of herbicide applications are described below or summarized in data tables. Granular herbicides were applied with a shaker bottle and sprayables were applied with a CO₂ pressurized (36 psi) sprayer (8004E nozzle) calibrated to deliver 50 gpa. Study areas were irrigated within 24 hours of treatment. All studies were arranged as a randomized complete block with four replications, and plots were 5 by 5 ft. Study sites were mature stands of 'Fylking' or 'Kenblue' Kentucky bluegrass (Poa pratensis L.) maintained at 1.5 inches. Soil was a Chillum silt loam with a pH of 6.2 to 6.4, and 2.4 to 2.7% organic matter. Although smooth crabgrass seedlings were first observed 27 April 1992, major germination did not begin until June, continued throughout July, and subsided by 10 August 1992. Percent of plot area covered by smooth crabgrass was visually determined on a 0 to 100% linear scale on 10 July and again between 22 to 25 August 1992. Although percent of control ≥90 is considered excellent, crabgrass cover ratings exceeding 5% would be considered objectionable in professionally managed turfgrasses. Significantly different means were separated by Duncan's multiple range test at P = 0.05. In Study I, various rates of two formulations of dithiopyr were applied on 8 April 1992, and one treatment was applied early postemergence on 8 June 1992. Nearly all treatments (dithiopyr 1EC at 0.38 and 0.50 lb ai/A; MON 25134 0.1G at 0.187, 0.250, and 0.375 lb ai/A; and Barricade 65DG at 0.65 lb ai/A) provided ≥94% control. MON 25134 0.1G (0.125 lb ai/A), however, provided marginally acceptable control. Dithiopyr 1EC (0.5 lb ai/A) applied postemergence when crabgrass in the 1 to 4-leaf stage provided 99% season-long control. In Study II, two formulations of oxadiazon and several experimental herbicides were evaluated (Table 1). Preemergence treatments were applied either on 17 March or 1 April 1992. Due to heavy smooth crabgrass germination throughout June and July, many treatments provided less than 90% control. Ronstar (4.0 lb ai/A) applied 17 March provided less control (78 - 79%) than counterpart Ronstar treatments (89 - 95%) applied 1 April. Ronstar Biodac formulation was slightly more efficacious than the clay formulation when applied on 1 April. Excellent control (i.e. >90%) was provided by EXP 30742B 2.3G (5.0 lb ai/A); EXP 30909A 4G (5.0 lb ai/A); and Pre-M 60 DG. Superior control (i.e. ≤5% crabgrass cover) was achieved by Ronstar 2G (Biodac) + Dimension (2.0 + 0.125 lb ai/A); EXP 30742B 2.3G (6.0 lb ai/A); EXP 30910A 5G (6.0 lb ai/A); and Ronstar 2G (Biodac; 4.0 lb ai/A). In Study III, various commercially available preemergence herbicides were evaluated. Corn speedwell (Veronica arvensis L.) emerged in the study site following herbicide application on 8 April 1992. Excellent preemergence control of speedwell was provided by Gallery + Team; Dimension products; Barricade 65DG (0.65 lb ai/A); and Dacthal 6F. Ronstar 2G (Biodac; 4.0 lb ai/A) and Team 2G also provided very good speedwell control. None of the herbicides injured or discolored the turfgrass, and turf color was improved by granular products formulated with fertilizer. Again, due to heavy smooth crabgrass germination throughout June and July, most herbicides provided less than 90% control. Excellent control was provided by Lebanon Dimension (0.31 lb ai/A) and Gallery + Team 1.09G. Superior control was provided by Ronstar 2G (Biodac; 4.0 lb ai/A) and Lebanon Dimension 0.09G (0.38 lb ai/A). Most other treatments provided good season-long control. However, very poor control (i.e. ≤75%) was associated with Balan 2.5G; Dimension (0.38 lb ai/A); Lescosan 4EC; and Dacthal 6F." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Fidanza, M. A., and P. H. Dernoeden. 1993. Evaluation of preemergence herbicides for smooth crabgrass control in Maryland, 1992. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 47:p. 91-92. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1993_vol47.pdf#page=91
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 v. 53 |
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