Full TGIF Record # 225489
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2006 Proceedings-SWSS.pdf#page=306
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Author(s):Baumann, P. A.; Medlin, C. R.; Murray, D. S.; Castner, E. P.; Rupp, R. N.
Author Affiliation:Texas Cooperative Extension, College Station, Oklahoma State University, Stillwater, and DuPont Crop Protection, Weatherford, TX, and Ardmore, OK
Title:Field sandbur (Cenchrus incertus) control and bermudagrass (Cynodon dactylon) tolerance to pre and post herbicide applications
Section:Symposia - grassy weed control in pastures
Other records with the "Symposia - grassy weed control in pastures" Section
Meeting Info.:San Antonio, Texas: January 23-25, 2006
Source:Proceedings: Southern Weed Science Society 59th Annual Meeting. Vol. 59, 2006, p. 234.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Application timing; Cenchrus spinifex; Cynodon dactylon; Herbicide application; Herbicide efficacy; Herbicide evaluation; Herbicide resistance; Pastures; Weed control
Abstract/Contents:"Field studies were conducted in Texas and Oklahoma during 2005 to examine field sandbur control and bermudagrass tolerance to several PRE and POST herbicides and combinations. Experiments were conducted near College Station, TX, and Medford and Ft. Cobb, OK. Standard small plot field experimentation techniques were employed at all three locations. Plots were sprayed with CO2 backpack sprayers calibrated to deliver 15 GPA in the Oklahoma trials and 20 GPA in the Texas trials. In the Oklahoma trials, four replications of each treatment were sprayed on 10 ft. X 25 ft. plots which were arranged in an RCB design. In the Texas studies, two separate locations were utilized, one for the field sandbur efficacy studies where no bermudagrass was present and another for a herbicide tolerance study that contained a weed free stand of Coastal bermudagrass. In the Texas field sandbur efficacy studies, three replications of 10 ft. X 15 ft. plots were employed and arranged in an RCB design. In the bermudagrass tolerance study, four replications were employed using a plot size of 10 ft. X 20 ft. One experiment was established at all three locations to evaluate Accent (nicosulfuron) applied at O.83, 1.043, and 1.25 oz../A in combination with Ally (metsulfuron) applied at 0.167, 0.208 and 0.25 oz./ A , respectively. In addition, the low and high rates of these combinations were applied with 16 oz. per acre of Karmex (diuron) in two treatments, along with a separate treatment of Plateau applied at 4 oz./A. When evaluated 23 to 35 DAT, all treatments provided greater than 80% field sandbur control, except the highest combination of Accent and Ally applied at the Medford site. At the Ft. Cobb site, all treatments exceeded 90% control. Common bermudagrass injury was slight to moderate (30-45%) from the Accent/Ally combination rates at both the Medford and Ft. Cobb sites but dissipated during the growing season. When Karmex was added to the Accent/Ally combinations, bermudagrass injury was significantly and substantially reduced, ranging from 8-17% when rated from 22 to 29 DAT. In contrast to these studies, no Coastal bermudagrass injury was shown at the College Station site from the Accent/Ally combinations. However, when Karmex was added, severe (>70%) chlorosis was observed 7 DAT but disappeared by the 55 DAT evaluation. Coastal bermudagrass yields were not affected by any of the treatments. Plateau was highly injurious (>65% stunting) at the Oklahoma sites but only slightly injurious at the College Station site. At all three locations in Oklahoma and Texas, a similar protocol was employed to examine control from PRE and POST herbicide applications. PRE applications included Prowl (pendimethalin) applied at 3 and 6 pts./A, Sinbar (terbacil) at 1.5 lb./A, Dual II Magnum (s-metolachlor) at 1.5 pts./A, and Karmex at 2.0 lb./A. POST treatments included Accent 0.75 to 1.33 oz./A, Journey (imazapic plus glyphosate) at 6 to 10 oz./A, Everest (flucarbazone) at 0.61 to 1.23 oz./A, and a combination of Accent plus Karmex (1.0 oz. plus 1.0 lb./A). At both Oklahoma sites, Prowl was ineffective largely due to lack of timely rainfall needed for activation. However, at the College Station site, timely rainfall was received and field sandbur control was equal to or above 90%. Results from the Karmex, Sinbar and Dual II Magnum treatments were also inconsistent between sites, however, precipitation was not a common factor for this disparity. Accent provided a high degree of control at the Ft. Cobb and College Station sites, ranging from 80 to 98% control from the rates examined. However, results from the Medford site showed only 48-75% control. Journey was highly effective at all locations, providing greater than 88% control. Everest provided a high degree (>83%) of field sandbur control at the College Station and Ft. Cobb sites, but similar to those results shown from Accent, control at the Medford site was reduced to 46 to 60%. In a separate study conducted at Medford, POST applications of Accent applied at 0.75, 1.0, and 1.33 oz./A and Journey at 6, 8, and 10 oz./A were studied. Field sandbur control from Accent ranged from 42 to 75% while Journey provided from 85 to 90% control. Common bermudagrass injury from Accent ranged from 20 to 50% and from 60 to 70% for Journey."
Language:English
References:0
Note:"Vision for the future"
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Baumann, P. A., C. R. Medlin, D. S. Murray, E. P. Castner, and R. N. Rupp. 2006. Field sandbur (Cenchrus incertus) control and bermudagrass (Cynodon dactylon) tolerance to pre and post herbicide applications. South. Weed Sci. Soc. Proc. 59:p. 234.
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http://www.swss.ws/wp-content/uploads/docs/2006 Proceedings-SWSS.pdf#page=306
    Last checked: 07/18/2013
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    Notes: Item is within a single large file
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