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Alternatives to Glyphosate for Creeping Bentgrass Control
| Description: | |  |
| Author: | S. D. Askew, J. B. Beam, and D. C. Riego |
| Author Org: | Virginia Tech and Monsanto Company |
| Date: | 01/07/2005 |
| Presenter: | S. D. Askew |
| Conference: | Northeastern Weed Science Society |
| Location: | Cambridge, MA |
| File Formats: | |
| Abstract: | Glyphosate-resistant creeping bentgrass (Agrostis stonlonifera L.) is under review by the United States Department of Agriculture for use on golf course fairways and greens. This registration could come as early as 2005. Creeping bentgrass resistant to glyphosate will increase weed management options for golf course managers. However, since glyphosate is the most common herbicide used for turfgrass renovation, escaped plants will require alternative herbicides. Glyphosate is not always completely effective for creeping bentgrass control but alternative herbicides must be just as affective as glyphosate or more so. In addition, creeping bentgrass is naturally found in riparian areas where few herbicides can be used. Imazapyr, glyphosate, and mesotrione all have an environmental and toxicological profile conducive to aquatic use. A study was conducted in Blacksburg, VA to evaluate several herbicides for creeping bentgrass control. The study was established on a sward of creeping bentgrass ‘L-93’ maintained at 1.5 cm height and conducted as a randomized complete block with three replications. Treatments included imazapyr as a 480 g/L formulation applied at 0.5, 1.0, 1.5, and 2.0 % v/v; glyphosate as a 480 g/L formulation applied at 2.0 % v/v, dazomet surface applied at 420 kg/ha and watered daily for 7 d, glufosinate as a 120 g/L formulation applied at 3.1 % v/v, and mesotrione applied twice at 0.28 kg ai/ha in two-week intervals. All liquid treatments were applied with water at 935 L/ha to 1 m by 2 m plots. Nonionic surfactant was included at 0.25% v/v with mesotrione. All treatments except mesotrione controlled creeping bentgrass at least 96 % 2 weeks after treatment (WAT). At 6 WAT, all treatments controlled creeping bentgrass at least 96%. At 13 WAT, glyphosate and all rates of imazapyr controlled creeping bentgrass 100% while dazomet, mesotrione, and glufosinate controlled creeping bentgrass 97, 85, and 57%, respectively. These results indicate that imazapyr and mesotrione should be evaluated further in aquatic environments. Imazapyr is completely effective for creeping bentgrass control in terrestrial environments but residual soil activity may limit its use if reseeding is desired. Mesotrione, glufosinate, and surface-applied dazomet may require sequential treatments or tank mix combinations for complete creeping bentgrass control. |
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