Full TGIF Record # 38942
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Publication Type:
i
Report
Author(s):Montgomery, D. P.; Martin, D. L.; Cargill, L. M.; Baird, J. H.
Author Affiliation:Department of Horticulture and Landscape Architecture, Oklahoma State University, Stillwater, OK 74078
Title:Effects of selected herbicides and adjuvants on control of johnsongrass in bermudagrass roadsides
Meeting Info.:48th Annual Meeting, Memphis, TN, January 16-18, 1995
Source:Southern Weed Science Society Proceedings. Vol. 48, January 1995, p. 152.
Publishing Information:Champaign, IL: Southern Weed Science Society.
# of Pages:1
Keywords:TIC Keywords: Sorghum halepense; Cynodon dactylon; Herbicides; Adjuvants; Lolium perenne
Abstract/Contents:"A field of study was initiated in May 1994 to evaluate the efficacy of selected herbicide combinations and adjuvants for control of perennial johnsongrass and tolerance of common bermudagrass. Herbicide treatments evaluated included Cadre (imazameth, AC-263, 222) at 0.125 lb.ai./A, alone, and combined with Pursuit (imazethapyr) at 0.063 lb.ai./A, or Roundup (glyphosate) at 0.25 lb.ai./A, or Arsenal (imazapyr) at 0.09 lb.ai./A. Herbicide treatments were combined with a nonionic surfactant plus fertilizer (Brand-Squire) at 0.25% V/V or a methylated seed oil (Brand-Sunrise) at 1.25% V/V. Treatments were applied to actively growing johnsongrass on 24 May (12 to 18 inches in height) and 15 June (24 to 40 inches in height) 1994. Treatments were applied using a ²-powered hand-held boom sprayer calibrated to deliver 20 gallons of water per acre. The treatments were arranged in a ramdomized complete block with three replications. Visual evaluations were made 50 and 100 days-after-treatment (DAT) for percent johnsongrass control and bermudagrass injury as compared to the untreated check. All of the sixteen treatments produced unacceptable johnsongrass control throughout the duraiton of this study. An acceptable level of johnsongrass control from treatments of this nature would be approximately 90% control for at least 8 to 10 weeks (56-70 DAT). Johnsongrass control from the 24 May treatments could have been reduced by a short light rain which fell immediately after the application. At 50 DAT ratings all of the early herbicide treatments when combined with the surfactant/fertilizer provided for 53% johnsongrass control or less. Johnsongrass control was noticeably improved when herbicides were combined with the methylated seed oil. By 50 DAT control of johnsongrass increased from 25 to 47% for Cadre alone, 35 to 75% for Cadre plus Arsenal, 38 to 58% for Cadre plus Roundup, and 25 to to 50% for Cadre plus Pursuit. At 100 DAT johnsongrass control decreased for all treatments, except for the Cadre/Arsenal combination plus methylated seed oil at the 15 June application date. Bermudagrass injury in the range of 40 to 45% that did not persist for more than 4 to 6 weeks would be acceptable for roadsides in Oklahoma. At 50 DAT all herbicide treatments, except Cadre alone, when combined with the methylated seed oil produced unacceptable bermudagrass injury. Early treatments of Cadre/Roundup plus surfactant/fertilizer and Cadre/Arsenal plus surfactant fertilizer also produced unacceptable injury. At 100 DAT the treatments of Cadre/Arsenal plus methylated seed oil applied early or late continued to produce unacceptable bermudagrass injury. All other treatments produced moderate to low levels of injury which was acceptable."
Language:English
References:0
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Montgomery, D. P., D. L. Martin, L. M. Cargill, and J. H. Baird. 1995. Effects of selected herbicides and adjuvants on control of johnsongrass in bermudagrass roadsides. South. Weed Sci. Soc. Proc. 48:p. 152.
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