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ARS Home » Research » Publications at this Location » Publication #83942
Title: BERMUDAGRASS TOLERANCE TO POSTEMERGENCE HERBICIDES

Author
item KOGER, T - OKLAHOMA STATE UNIVERSITY
item STRITZKE, J - OKLAHOMA STATE UNIVERSITY
item TALIAFERRO, C - OKLAHOMA STATE UNIVERSITY
item Phillips, William

Submitted to: American Forage and Grassland Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 10/1/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Bermudagrass (Cynodon dactylon L.) is an important forage for the livestock industry of the southern U.S. Herbicides are important management tools for establishment and renovation of weed infested pastures. According to a 1996 survey, approximately 40% of Oklahoma's 3.1 million acres of bermudagrass received annual herbicide applications. The objective of this research was to evaluate effects of various herbicide treatments on three released bermudagrass cultivars Midland, Tifton 44 and Harie) and experimental cultivars 74 x 12-12, 74 x 12-6, 74 x 11-2). Studies were conducted on excellent weed-free established stands used for grazing research at USDA-ARS Laboratory, El Reno, Oklahoma. Herbicide treatments evaluated included: auxin-type herbicides; 1) 2,4-D LVE at .95 lb ae/A, 2) Banvel (dicamba at .5 lb ae/A), 3) Tordon 22K (picloram at .5 lb ae/A), 4)Remedy (triclopyr at 1 lb ae/A); non-auxin type herbicides, 5) Ally (metsulfuron-methyl at .18 lb ai/A), 6) Amber (triasulfuron at .315 lb ai/A), 7) Zorial (norsulfurzan at .786 lb ai/A); mixtures, 8) Grazon P+D (picloram + 2,4-D a 5,.635, and .953 lb ae/A), 9) Weedmaster (2,4-D + dicamba at .484, .968, and 1.455 lb ae/A); and 10) no herbicide. Bermudagrass stem heights and forage yields were taken approximately 14 and 42 days after treatment (DAT). No significant stem height or forage yield reductions was noted on any of the cultivars with 2,4-D LVE, Banvel, Ally, Amber, Zorial, Grazon P=D (picloram + 2,4-D at .312 lb ae/acre), and Weedmaster (dicamba + 2,4-D at .484 and .968 lb ae/acre). Remedy caused significant forage yield reductions of Hardie, Midland, 74 x 12-6 and 74 x 12-12. Hardie was the most sensitive of the six cultivars evaluated.