Full TGIF Record # 225214
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2005 Proceedings-SWSS.pdf#page=278
    Last checked: 07/18/2013
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i
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Author(s):Evans, C. C.; Montgomery, D. P.; Martin, D. L.
Author Affiliation:Horticulture and Landscape Architecture Department, Oklahoma State University, Stillwater, OK
Title:Johnsongrass control with glyphosate formulations in Oklahoma
Section:Vegetation management - rights-of-ways
Other records with the "Vegetation management - rights-of-ways" Section
Meeting Info.:Charlotte, North Carolina: January 24-26, 2005
Source:Proceedings of the 58th Annual Meeting of the Southern Weed Science Society. Vol. 58, 2005, p. 199.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Glyphosate; Herbicide evaluation; Herbicide formulations; Sorghum halepense; Weed control
Geographic Terms:Oklahoma
Abstract/Contents:"A roadside weed control study was conducted during the summer of 2004 to evaluate johnsongrass (Sorghum halepense (L.) Pres.) control with six glyphosate formulations tank mixed at two rates with Outrider. Each glyphosate formulation and rate was tank mixed with Outrider at 1.33 oz prod. / A. Glyphosate formulations were MON 78754, 10 & 13 oz / A, MON 79688, 8.25 & 10.7 oz / A, MON 79730, 8.25 & 10.7 oz / A, MON 78503, 7.4 & 9.6 oz / A, MON 79527, 8.25 & 10.7 oz / A, and MON 79528, 8.25 & 10.7 oz / A. Treatments were applied 18 May to johnsongrass ranging in height from 12 inches to 18 inches. Treatments were applied to 5 by 15 foot plots using a CO2 powered boom sprayer calibrated to deliver 30 gallons of spray solution per acre. Treatments were replicated 3 times in a randomized complete block design. Visual weed control ratings were taken for johnsongrass at 7, 14, 28, 56 and 84 days-after-treatment (DAT). Ratings were also collected on common bermudagrass (Cynodon dactylon var. dactylon) injury at 7, 14 and 28 DAT. Most treatments were producing moderate amounts of johnsongrass control (51-75%) at 7 DAT. MON 79528 and 79503 were producing the best control at the higher rate. At 14 DAT all treatments were providing increased levels of johnsongrass control. The higher rates of MON 79528, 79688, 79503, and 79527 were all producing good (81 - 88%) control of johnsongrass with other rates and formulations producing moderate control levels. At 28 DAT all treatments were showing slight decreases in johnsongrass control which was possibly due to abundant rainfall during June. MON 79527, 79528, and 79688 formulations were still maintaining good johnsongrass control (80- 81%) at 28 DAT. At 56 DAT the high rate of MON 79527 was the only treatment maintaining an 80% or greater level of johnsongrass control (84%). MON 79688 and 79503 were producing johnsongrass control levels of 78 and 79%. At the final 84 DAT evaluations only the MON 97527 was maintaining johnsongrass control levels above 80% (83%). The formulations MON 79688 and 79503 were maintaining johnsongrass control levels of 78 and 76%. Any treatment able to maintain >= 80% or better johnsongrass control at 84 DAT during wet summer should yield positive results in a roadside weed control program. Common bermudagrass injury ranged from 2-10% through the 28 DAT evaluations. This level of injury is acceptable for roadsides. This study was conducted using a blind format where we did not know the chemical identity of the MON glyphosate formulations. Many of the formulations that performed well in the test were experimental formulations that may be commercialized in the near future."
Language:English
References:0
Note:"The changing world of weed science"
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Evans, C. C., D. P. Montgomery, and D. L. Martin. 2005. Johnsongrass control with glyphosate formulations in Oklahoma. South. Weed Sci. Soc. Proc. 58:p. 199.
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http://www.swss.ws/wp-content/uploads/docs/2005 Proceedings-SWSS.pdf#page=278
    Last checked: 07/18/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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