Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 2/10/2011
Publication Date: 2/26/2011
Citation: Price, A.J., Patterson, M.G., Monks, C.D., Kelton, J.A. 2011. Evaluation of a high-residue cultivator for palmer amaranth control in conservation -tillage systems [abstract]. Southern Weed Science Society Annual Meeting. CDROM. Interpretive Summary:
Technical Abstract: Resistant Palmer amaranth control in conservation systems continues to challenge producers. Recommendations currently include sequential soil applied herbicides in an attempt to prevent Palmer amaranth emergence. However, in the event activation is inadequate, alternative postemergence control options are needed. An experiment was conducted evaluating a high-residue sweep cultivator in both conventional and conservation tillage systems in corn, cotton, and soybean. Preemergence herbicide treatments applied broadcast in corn or both broadcast and banded in cotton and soybean included: S-metolachlor at 1.12 kg/ ai/ha plus atrazine at 1.68 kg ai/ha in corn, flumioxazin applied at 0.07 kg/ai ha in soybean, and pendimethalin at 1.12 kg ai/ha plus fomesafen at 0.28 kg ai/ha in cotton. Glyphosate applied at 1.12 kg/ai ha was applied in all systems EPOST. Cultivation treatments included either rolling cultivator or sweep cultivators applied late POST. In corn, results indicate >90% Palmer amaranth when the sweep cultivator was utilized in combination with PRE herbicides, sicklepod was not controlled with either cultivator following PRE applications. In cotton, results indicate >90% Palmer amaranth, tall morningglory, or sicklepod between row control when the sweep cultivator was utilized in combination with PRE herbicides banded or broadcast. Palmer amaranth control utilizing cultivation in soybean was similar to control in cotton. Neither cultivation treatment alone provided adequate weed control in any crop. The sweep disturbed relatively little residue when utilized in a high-residue setting. Future research will compare weed control utilizing high-residue sweeps in various weed control systems augmenting control when soil applied herbicides utilized in controlling resistant Palmer amaranth fail due to lack of activation.