Influence of Roundup with Adjuvants and other Herbicides for Control of Roadside Bermuda Grass
Author(s):
R.E. Meyer, E.S. Motteram, W.G. McCully
Publication Date:
January 1995
Abstract:
Two tests each demonstrated the response of bermudagrass [Cynodon dactylon (Pers.)] on the roadside pavement edge and shoulder (1) to Roundup (glyphosate) alone and with 11 adjuvants and (2) with Arsenal (imazapyr) and Oust (sulfometuron). Treatments were sprayed in May and rated five times in the following 16 weeks. Researchers applied Roundup herbicide alone at 3.5, 4.7, and 9.4 L/ha (1.5, 2, 3, and 4 qt/A) and at 3.5, 4.7, and 7.0 L/ha with 11 adjuvants including: Apsa-80, BioPlus, Cide-Kick II, Exacto XL, Kinetic, Raider-TG, Saturall 85, X-77, X-77+ammonium sulfate, HUK-12, and Agri-Dex. Bermudagrass control averaged 7% higher on the pavement than on the shoulder. Averaged over all adjuvants and ratings, Roundup rates at 3.5, 4.7, and 7.0 L/ha produced 49, 56, and 64% bermudagrass injury. Averaged over 38 treatments, bermudagrass injury was 54, 72, 73, 52, and 27% at 2, 4, 8, 12, and 16 weeks after treatment, respectively. Averaged over three Roundup rates and five rating dates, Apsa-80, Exacto XL, Kinetic, Raider-TG, Saturall 85, X-77+ammonium sulfate, and Agri-Dex increased bermudagrass control slightly from 57 to 62% compared with 53% with Roundup alone. BioPlus, Cide-Kick II, and X-77 had no effect on Roundup effectiveness; HUK-12 reduced Roundup effectiveness to 46%. Arsenal at 4.7 L/ha ( 2 qt/A or 1lb ae/A) was the most effective treatment producing 69 and 90% bermudagrass control over a 16-week period at Flynn and Center, TX, respectively, and more than 95% at 4 to 8 weeks after spraying at both sites.|Roundup+Arsenal at 2.3+2.3 L/ha (1+1 qt/A) produced 80 and 96% bermudagrass control at 8 weeks and 12 and 91% control 16 weeks after spraying at Flynn and Center, TX, respectively. Addition of Oust at the rate of 140 g/ha (2 oz product/A) to Roundup at 7.0 L/ha (3 qt/A) had no effect on bermudagrass control.
Report Number:
902-11
Electronic Link(s):
Document/Product
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