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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Scroggins, T. B.;
Martin, D. L.;
Murray, D. S.;
Bell, G. E. |
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| Author Affiliation: | Oklahoma State University, Stillwater, OK |
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| Title: | Response of OKS 91-11 and OKS 95-1 to commonly used post-emergent herbicides |
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| Section: | Section II: Weed management in turf, pasture and rangeland
Other records with the "Section II: Weed management in turf, pasture and rangeland" Section
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| Meeting Info.: | 53rd Annual Meeting, Tulsa, OK, January 24-26, 2000 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 53, 2000, p. 54-55. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Herbicide evaluation; Postemergence herbicides; Postemergence weed control; Cynodon; 2,4-D; Mecoprop; Dicamba; Triclopyr; Clopyralid; Imazaquin; MSMA; Metribuzin; Pronamide; Halosulfuron; Bentazon; Quinclorac; Diclofop methyl; Application rates; Phytotoxicity; Cultivar evaluation; Clipping weight; Herbicide combinations
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| Cultivar Names: | OKS 91-11 |
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| Abstract/Contents: | "Bermudagrass (Cynodon spp.) is one of the most widely used turfgrasses in the southern United States. For years turf managers have been faced with the challenge of chemical weed control without injury to the turf. Herbicide injury to turf can be caused by many factors such as, improperapplication [improper application] rates, incorrect calibration, overlapping spray patterns, or species intolerance to the herbicide. The objective ofthis [of this] research was to examine the color, quality, phytotoxicity, and clipping yield response of OKS 91-11 and OKS 95-1 seeded bermudagrasses to commonly used post-emergent herbicides at 1x and 2x label rates. This research focused on the newly released seeded bermudagrass OKS 91-11 and the promising experimental variety OKS 95-1. Field experiments were conducted in 1999 at the Oklahoma State University Turf Research Center, Stillwater OK. A randomized complete block design with 3 replications was used with plot sizes of 1.4 x 2.6 m. The experiment was seeded with OKS 91-11 and OKS 95-1 at 49 kg of pure live seed ha-1 on 5 May 1999. The soil type was a loam soil containing 2.2% organic matter and having a pH of 7.2. Prior to establishment and every 4-5 weeks after, the area was fertilized with 49 kg N ha-1 using a 46-0-0 (N-P-K) source. Irrigation was applied 2-3X wk-1 from an automatic irrigation system to prevent wilting. All plots were mowed at a normal fairway height of 1.3 cm. The week of application, nitrogen was applied at 98 kg N ha-1 using a 40-0-0 (nutralene) source that gave an extended fertilization period during data collection. Herbicide treatments consisted of sprayable formulations of 2,4-D + MCPP + dicamba (1.85 and 3.7 kg ha-1), triclopyr + clopyralid (0.83 and 1.66 kg ha-1), imazaquin (0.56 and 1.12 kg ha-1), MSMA (3.37 and 6.74 kg ha-1), MSMA + metribuzin (3.37 + 0.18 and 6.74 + 0.36 kg ha-1), metribuzin (0.56 and 1.12 kg ha-1), pronamide (1.67 and 3.34 kg ha-1), halosulfuron (0.049 and 0.098 kg ha-1), bentazon (1.25 and 2.48 kg ha-1), quinclorac (0.83 and 1.66 kg ha-1), and diclofopmethyl (1.13 and 2.26 kg ha-1). Treatments were applied using a compressed air-pressurized bicycle sprayer with 11003VS flat fan tips on 6 August 1999. Phytotoxicity ratings were collected weekly starting at 7 DAT and continuing for 8 weeks. Ratings were taken on a 0-10 scale with 0 equaling no phytotoxicity. Clippings (dry matter yield) from a 0.5 x 2.6 m area with in [within] each plot were taken 1X wk-1 during 7-56 DAT. An ANOVA was performed on each data set and an LSD test was used to separate treatment means at the P<0.05 level. Data showed that both 1x and 2x rates of triclopyr + clopyralid produced the longest period of phytotoxicity, over 35 DAT. Metribuzin and 2,4-D + MCPP + dicamba at the 2x rate showed extended phytotoxicity for at least 21 DAT. Clipping yields showed that triclopyr + clopyralid at 1x and 2x rates reduced clipping yields for at least 21 DAT. Both 1x and 2x rates of 2,4-D + MCPP + dicamba produced a significant reduction in clipping yields for at least 7 DAT. Each cultivar had a unique phytotoxicity response to the herbicides but overall, OKS 95-1 phytotoxicity response peaked more quickly and it recovered more quickly. The recovery rate of OKS 95-1 can be attributed to the grass's aggressive growth rate. Due to the vigorous growth rate of OKS 95-1, clipping yields tended to recover faster and provided an overall higher yield than OKS 91-11. With air temperatures excessively high and the bermudagrasses not completely mature, these 1999 research results represent a near worst-case scenario. Data showed that some common post-emergent herbicides can cause injury to both OKS 91-11 and OKS 95-1, even when applied at the labeled rates under nonoptimal environmental conditions." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: M S M A
Other items relating to: 2, 4 - D in Turf |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Scroggins, T. B., D. L. Martin, D. S. Murray, and G. E. Bell. 2000. Response of OKS 91-11 and OKS 95-1 to commonly used post-emergent herbicides. South. Weed Sci. Soc. Proc. 53:p. 54-55. |
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