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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1999_vol53.pdf#page=98
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): | Gover, A. E.;
Johnson, J. M.;
Kuhns, L. J. |
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| Author Affiliation: | Gover and Johnson: Project Associates, The Pennsylvania State University, University Park, PA; Kuhns: Professor of Horticulture, The Pennsylvania State University, University Park, PA |
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| Title: | Comparison of spring-applied herbicides for control of giant knotweed during roadside renovation |
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| Meeting Info.: | Cambridge, MA: January 4-7, 1999 |
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| Source: | Proceedings of the 53rd Annual Meeting of the Northeastern Weed Science Society. Vol. 53, 1999, p. 98-99. |
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| Publishing Information: | College Park, MD: Northeastern Weed Science Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Herbicides; Application timing; Spring; Herbicide evaluation; Weed control; Renovation; Polygonum sachalinense; Roadside turf; Herbicide combinations; Tank mix; Clopyralid; Dicamba; Glyphosate; Imazameth; Imazapyr; Picloram; Festuca rubra subsp. rubra; Overseeding; Lolium multiflorum
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| Abstract/Contents: | "As part of an ongoing research project funded by the Pennsylvania Department of Transportation, two field trials were established to evaluate the efficacy of various herbicide combinations for the control of giant knotweed (Polygonum sachalinense F.Schmidt ex Maxim). The herbicide combinations were evaluated as part of a renovation scheme calling for spring primary treatments with follow-up treatments and seeding of a grass mixture occurring in late summer. Giant knotweed and Japanese knotweed (Polygonum cuspidatum Sieb. & Zucc.), are herbaceous, perennial species, growing in dense colonies reaching heights of 3 m. When growing close to the road, these species cause reduction of sight distance and damage the road surface by growing up through the asphalt at the road edge. Applications made in the spring before plants reach their full height are less difficult. The trials were established on April 30, 1998, in Doylestown, PA, on a north-facing fill slope; and May 14, 1998, near Leechburg, PA, on a fill shoulder above the east bank of the Kiskiminetas River. The herbicides included in the ten combinations were clopyralid, dicamba, glyphosate, imazameth, imazapyr, and picloram (Table 1). Treatments at the Doylestown site were applied using a CO₂-powered, hand-held boom sprayer, equipped with Spraying Systems XR 8002 VS flat fan tips. The mixtures were applied at 187 l/ha at 172 kPa to 3.7 by 6.1 m plots arranged in a randomized complete block design with three replications. Giant knotweed ranged from just emerging to 1 m in height, with an average canopy height of 0.5 to 0.7 m. Treatments at the Leechburg site were applied using a CO[2-powered, hand-held sprayer with a two-nozzle swivel valve equipped with a Spraying Systems 1504 flat fan and a #5500 Adjustable ConeJet with an X-6 tip. The plots were 14 m long, while the depth varied from 3 to 5 m. The experimental design was a randomized complete block with two replications. At treatment, the knotweed was 1.5 to 2 m high. At Doylestown, visual ratings of percent necrosis were taken May 28, and percent control and cover were taken August 31. At Leechburg, ratings were taken July 2 for percent control, and September 1 for percent control and cover. Immediately following the second rating, both sites were oversprayed with glyphosate plus picloram, at 3.3 plus 0.28 kg/ha. A mixture of hard fescue (Festuca brevipila Tracey), creeping red fescue (Festuca rubra ssp rubra L.), and annual ryegrass (Lolium multiflorum Lam.) was overseeded at Doylestown on September 14, and Leechburg on September 15. There was no significant difference between any of the treatments at the Leechburg site. Percent control of giant knotweed on September 1 ranged from 70 to 100 percent, and percent ground cover ranged from 1 to 19 percent. At the Doylestown site, the glyphosate-based treatments provided 59 to 76 percent control on August 31, while the treatments with growth-hormone type herbicides as the primary ingredient provided 86 to 99 percent control. Ground cover ratings ranged from 32 to 80 percent. Common pokeweed (Phytolacca americana L.) was the predominant species colonizing the study area. Other species included giant foxtail (Setaria faberi Herrm.), American burnweed (Erechtities hieraciifolia (L.) Raf. ex DC.), and crownvetch (Coronilla varia L). The true effectiveness of these treatments in a renovation program cannot be determined until the final data is collected in 1999. However, the positive results provided by several of the treatments at both sites, at two different growth stages, indicates that roadside managers may have several options in the management of giant knotweed." |
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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):
Gover, A. E., J. M. Johnson, and L. J. Kuhns. 1999. Comparison of spring-applied herbicides for control of giant knotweed during roadside renovation. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 53:p. 98-99. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1999_vol53.pdf#page=98
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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