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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1993_vol47.pdf#page=48
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Batey, David A.;
Kuhns, Larry J.;
Gover, Arthur E. |
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| Author Affiliation: | Batey: Research Aide; Kuhns: Professor of Ornamental Horticulture; and Gover: Project Associate, Pennsylvania State University, University Park, PA |
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| Title: | Vegetation control provided by fall or spring applications of non-selective herbicides |
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| Section: | Industrial forestry and conservation - Tuesday January 5
Other records with the "Industrial forestry and conservation - Tuesday January 5" 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. 48-49. |
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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: Autumn; Spring; Application timing; Herbicides; Roadside turf; Visual evaluation; Non-selective herbicides; Herbicide evaluation; Imazapyr; Sulfometuron; Bromacil; Tebuthiuron; Diuron; Application rates; Weed control; Festuca arundinacea; Dactylis glomerata; Poa pratensis; Elymus repens; Coronilla varia; Weed density; Bromus inermis; Seasonal variation
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| Abstract/Contents: | "A total vegetation control study to compare the effectiveness of fall and spring applications of five herbicides was initiated as part of a cooperative project between the Pennsylvania State University and the Pennsylvania Department of Transportation. The experimental design was a randomized complete block with a factorial treatment arrangement and two replications. The herbicide treatments were imazapyr at 0.75 lb ai/ac, sulfometuron methyl at 0.14 lb ai/ac, bromacil at 4.0 lb ai/ac, tebuthiuron at 3.2 lb ai/ac, and diuron at 8.0 lb ai/ac. Fall applications were made September 16, 1991, and spring applications were made April 15, 1992. The treatments were applied to 5 by 50 ft plots along a section of guiderail on Central Road, near New Stanton, PA. Fall treatments were applied with a CO₂ pressurized backpack sprayer delivering 11.5 gal/ac at 30 psi using two Spraying Systems OC-02 spray tips mounted inline on a double swivel nozzle body. One spray tip was angled forward, the other to the rear, to provide coverage on both sides of the guiderail posts. Prior to the fall application the predominant species were tall fescue (Festuca arundinacea Schreb.), orchardgrass (Dactylis glomerata L.), Kentucky bluegrass (Poa pratensis L.) quackgrass (Elytrigia repens L.), and crownvetch (Coronilla varia L.). The spring timing treatments were applied with a CO₂ pressurized backpack sprayer delivering 17.3 gal/ac at 24 psi using one Spraying Systems OC-08 spray tip. Visual ratings of percent vegetative cover were taken on April 15, 1992, 212 days after treatment (DAT), for fall treatments only; and June 9, 1992, 55 and 267 DAT for spring and fall treatments, respectively. A later season rating was not taken because the area was unfortunately excavated with a grader. Results are reported in Table 1. At the April 15 rating, plots treated with diuron had significantly more vegetation than plots treated with imazapyr, sulfometuron methyl, and tebuthiuron. Predominant species were the same as those recorded prior to treatment. On June 9 the predominant species in the test area were smooth brome (Bromus inermis Leyss.), crownvetch, quackgrass, and tall fescue. There was no significant interaction between herbicide treatment and application timing for the June 9 rating. Spring treated plots had significantly less cover on June 9, averaging 20 percent compared to 31 percent for fall treated plots. Plots treated with imazapyr received significantly lower cover ratings than any treatment except sulfometuron methyl. Plots treated with diuron received significantly higher cover ratings than any other treatment. Off-site movement was not observed for any of the treatments. On July 16, a field day was held at the test site where it was observed that the residual control provided by the fall application of imazapyr was failing, and the fall treated imazapyr plots had noticeably more vegetative cover than the spring treated plots. All plots should have been rated again in late summer, but were destroyed by the grading operation before that could be done. Under the conditions of this study, it appears that a September application of herbicides may be too early to provide control the following growing season, particularly if using imazapyr, as nearly seven months elapse between application and the onset of the growing season. Although the rate of herbicide degradation should be reduced during the winter, enough degradation or movement out of the surface layer of the soil occurs to limit the effectiveness of the treatments. If further investigation into fall treatments is undertaken, later applications should be evaluated, as many perennial herbaceous species are still green in November in this region, and may be susceptible to herbicide applications." |
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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):
Batey, D. A., L. J. Kuhns, and A. E. Gover. 1993. Vegetation control provided by fall or spring applications of non-selective herbicides. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 47:p. 48-49. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1993_vol47.pdf#page=48
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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