Submitted to: Western Society of Weed Science Meeting Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: January 1, 1996
Publication Date: N/A
Technical Abstract: Five herbicide treatments were compared for volunteer potato control in field corn grown under no-till and conventional tillage. No-till plots were chisel plowed, planted and treated with glyphosate at 1.12 kg/ha and metolachlor at 1.7 kg/ha 4 days after planting. Conventionally-tilled corn was disced and packed after chisel plowing, and was reservoir tilled at 4.5-5 wks after planting. Potato control with herbicide treatments ranged from 66-91% in 1994. Atrazine applied preemergence at 1.1 kg/ha followed by 2,4-D plus dicamba applied postemergence at 1.1 plus 0.28 kg/ha, respectively, in conventionally-tilled corn suppressed potatoes the most. In 1995, all herbicides controlled potatoes similarly in conventionally- tilled corn and potato control ranged from 94-96%. In no-till corn, potato control ranged from 87-96% and was greatest with dicamba plus primisulfuron applied postemergence at 0.28 plus 0.04 kg/ha, respectively, atrazine applied preemergence at 1.1 kg/ha followed by 2,4-D plus dicamba applied postemergence at 1.1 plus 0.28 kg/ha, respectively, or fluroxypyr applied postemergence at 0.22 kg/ha. Potato final tuber weight was not different among tillage levels in 1994 or 1995, but tended to be greater in no-till corn than in conventionally-tilled corn. All herbicide treatments reduced potato tuber weight in both years. In 1994, reduction in potato tuber weight with herbicides ranged from 64-96% in no-till corn and 89-99% in conventionally-tilled corn. In 1995, reduction in potato tuber weight with herbicides ranged from 76-95% in no-till corn and 85-98% in conventionally- tilled corn. In both years, potato tuber weight was the lowest in conventionally-tilled corn that received atrazine preemergence followed by 2,4-D plus dicamba applied postemergence.