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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=192
Last checked: 08/01/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Lewis, D. F.;
Gannon, T. W.;
Yelverton, F. H.;
Richardson, R. J.;
Jeffries, M. D. |
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| Author Affiliation: | Department of Crop Science, North Carolina State University, Raleigh, NC |
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| Title: | Effects of ambient moisture on aminocyclopyrachlor efficacy |
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| Section: | Weed management in turf
Other records with the "Weed management in turf" Section
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| Meeting Info.: | Little Rock, Arkansas: January 25-27, 2010 |
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| Source: | 2010 Proceedings, Southern Weed Science Society. Vol. 63, 2010, p. 142. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Aminocyclopyrachlor; Aminopyralid; Application rates; Cynodon dactylon; Cynodon dactylon x Cynodon transvaalensis; Herbicide evaluation; Auxins; Weed control
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| Cultivar Names: | Tifway |
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| Abstract/Contents: | "Synthetic auxin herbicides are used for selective broadleaf weed control in turfgrass settings. Aminocyclopyrachlor (DPX-MAT28) is a recently discovered pyrimidine carboxylic acid herbicide belonging to the synthetic auxin family. Aminocyclopyrachlor has a broad spectrum of weed control with low use rates and a favorable environmental profile. Preliminary reports indicate aminocyclopyrachlor is stable in aqueous environments but rapid photodecomposition can occur when exposed to sunlight. In golf course management, most herbicide applications are made in the morning when dew is present. If aminocyclopyrachlor applications were made to dew covered turf, there could be a potential for efficacy loss due to photodegradation. Research was conducted to determine the effects of ambient moisture on aminocyclopyrachlor efficacy. Research was conducted in 2009 at the North Carolina State University Lake Wheeler Turfgrass Unit in Raleigh, NC on 'Tifway 419' bermudagrass [Cynodon dactylon (L.) Pers. X C. transvaalensis Burtt-Davy]. 'Tifway 419' bermudagrass displays an intermediate tolerance to aminocyclopyrachlor and retains dews well compared to other turfgrasses. Experimental design was a randomized complete block with four replications in a factorial arrangement (five herbicide treatments by two moisture scenarios). Herbicide treatments included: DPX-MAT28 (79 grams a.e/ha); DPX-MAT28 (105 g/ha); DPX-MAT28-70 (84 g/ha); DPX-MAT28-71 (84 g/ha); aminopyralid (70 g/ha); and a nontreated check. Moisture scenarios included DRY plots (no dew present) vs. WET plots (dew present). DRY plots were covered overnight with tent structures to prevent dew formation. WET plots were left uncovered so natural dew could form. Structures were removed the following morning and herbicide applications were made with a CO2 pressurized spray boom calibrated to deliver 304 L/ha. Bermudagrass injury was visually rated on a 0-100% scale (0%=no visible turfgrass injury; 100%=complete turfgrass death). In addition, turfgrass quality ratings were taken using a Field Scout TCM 500 NDVI Turf Color Meter on a 0-9 scale (0=poorest quality; 9=highest quality). All herbicide treatments applied to WET plots showed greater injury than those applied to DRY plots 11 days after treatment (DAT). Applied to WET plots DPX-MAT28 (79 g/ha), DPX-MAT28 (105 g/ha), DPX-MAT28-70, DPX-MAT28-71, and aminopyralid injured 30, 38, 15, 14, and 36%, respectively. Applied to DRY plots, injury reduced to 25, 27, 10, 5, and 30%, respectively, for the same treatments. Turfgrass quality ratings for DPX-MAT28 (79 g/ha), DPX-MAT28 (105 g/ha), and aminopyralid on WET plots were 6.7, 6.5, and 6.4, respectively, compared to 6.8, 6.7, and 6.6, respectively, on DRY plots. DPX-MAT28 (79 and 105 g/ha) provided greater injury and reduced turfgrass quality more when applied to WET vs. DRY plots 21 DAT. Applied to WET plots, DPX-MAT28 (79 and 105 g/ha) injured 35 and 40%, respectively. Applied to DRY plots, injury reduced to 28 and 30%, respectively. Turfgrass quality ratings for DPX-MAT28 (79 and 105 g/ha) on WET plots were 5.9 and 5.5, respectively, compared to 6.4 and 5.9, respectively, on DRY plots." |
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| Language: | English |
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| References: | 0 |
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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):
Lewis, D. F., T. W. Gannon, F. H. Yelverton, R. J. Richardson, and M. D. Jeffries. 2010. Effects of ambient moisture on aminocyclopyrachlor efficacy. South. Weed Sci. Soc. Proc. 63:p. 142. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=192
Last checked: 08/01/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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