Full TGIF Record # 5866
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Web URL(s):http://www.wsweedscience.org//wp-content/uploads/proceedings-archive/1984.pdf#page=201
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Author(s):Bell, C. E.; Little, K.
Author Affiliation:Bell: University of California Cooperative Extension, El Centro, California; and Little: University of Arizona, Tucson, Arizona
Title:Bermudagrass response to multiple applications of postemergence grass herbicides at various timing
Source:Proceedings of the Western Society of Weed Science. 1984, p. 195-200.
# of Pages:6
Publishing Information:Spokane, Washington, USA
Keywords:TIC Keywords: Cynodon dactylon; Chemical control; Fluazifop-butyl; Herbicide timing
Abstract/Contents:"The recently introduced postemergence grass herbicides have been shown to be effective chemicals for control of bermudagrass (Cynodon dactylon (L.) Pers.) when applied in 2 separate treatments. The timing of the second application is at present a poorly defined recommendation. This trial was designed to evaluate several herbicides and timings for control of bermudagrass. The bermudagrass is being grown as a lawn and was irrigated regularly. Six herbicides: sethoxydim (2-(1-(ethoxyimino)butyl)-5-(2-(ethylthio)propyl)-3-hydroxy- 2-cyclohexen-1-one), fluazifop butyl (butyl 2-(4-(5-tri-floromenthy1-2-pyridyloxy)phenoxy)propianate), HOE-33171, CGA-82725, DPX-Y6202 (2-(4-((6-chloro-2-quinoxalinyl)oxy)-phenoxy)-propionic acid, ethyl ester), and SC-1084 were tested in a split plot design. Each herbicide was applied to plots 2 feet by 100 feet long, with 4 replications, on June 24, 1983. Separate 20 foot sections of each plot were retreated at different time intervals of 2 weeks, 5 weeks and 8 weeks after the first treatment. Untreated strips 1 foot wide were left between each plot as a control. All treatments were made with .5 pounds of active ingredient per acre. A single treatment of any of these herbicides was able to achieve 40 to 70% control 38 days after first treatment (DFT) at this rate. By 95 DFT the control had dropped to 18% or less and at 159 DFT control had reached 0% for all treatments. With a second treatment 2 weeks after the first, control ranged from 47.5 to 72.5% control at 38 DFT. By 95 DFT control was 5 to 18% and less than 15% at 159 DFT. When the second treatment was applied 5 weeks after the first, control was the same at 38 DFT. At 65 DFT, or 30 days after the second treatment, control was variable, ranging from 35% for CGA 82725 to 90% for sethoxydim. At 95 DFT, control ranged from 12.5 to 72.5%, with fluazifop-butyl showing the best activity. At 159 DFT control varied from 0 to 32.5%. Application of the second treatment 8 weeks after first treatment occurred when most plots had achieved considerable regrowth. Control at 65 DFT was from 20 to 30%. At 95 DFT, or 32 days after second treatment, control ranged from 40% for CGA 82725 to 90% for DPX - Y6202. At 123 DFT, or 60 days after the second treatment control for 5 herbicides varied from 22.5 to 47.5% and 20 to 30% at 159 DFT. At 123 DFT, control for DPX - Y602 was still 90% and 62.5% at 159 DFT."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bell, C. E., and K. Little. 1984. Bermudagrass response to multiple applications of postemergence grass herbicides at various timing. Proc. West. Soc. Weed Sci. p. 195-200.
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