Monday, November 13, 2006
24-4
Volunteer Canola Control in Corn, Soybean, Sunflower, Dry Pea, and Flax.
Brian M. Jenks, Gary P. Willoughby, and Denise M. Markle. North Dakota State Univ, 5400 Highway 83 South, Minot, ND 58701
A volunteer canola (VC) control study was conducted in 2004 and 2005 in Minot , ND to evaluate several herbicides for VC control in dry pea, flax, sunflower, soybean, and corn. VC control was better at the 3-leaf canola stage compared to 6-leaf or later. Only six postemergence herbicides provided excellent VC control at both timings. Several herbicides provided good to excellent VC control at the 3-leaf stage, but significantly less control at the 6-leaf stage. In peas, soil-applied metribuzin provided good to excellent VC control. Metribuzin applied postemergence provided good VC control at the 3-leaf stage, but only fair control at the 6-leaf stage. In 2004, VC control with MCPA amine and bentazon was good to excellent at the 3-leaf stage, but very poor at the 6-leaf stage. In 2005, MCPA amine and bentazon provided poor to fair control at either stage. Imazamox provided good to excellent control at either stage both years. In flax, soil-applied sulfentrazone provided poor control. Bromoxynil&MCPA ester provided excellent VC control at the 3-leaf stage, but 10-20% less control at the 6-leaf stage. In tribenuron-resistant sunflower, tribenuron and imazamethabenz provided good to excellent VC control. In soybeans, soil-applied flumioxazin and imazethapyr&glyphosate provided good to excellent VC control, while metribuzin and flumetsulam provided fair to good control. Imazamox and fomesafen provided excellent VC control. Lactofen provided good control at the 3-leaf stage, but 25-50% less at the 6-leaf stage. Bentazon provided excellent control at the 3-leaf stage, but only fair to good control applied later. Acifluorifen provided poor VC control at either timing. In corn, soil-applied isoxaflutole provided excellent VC control. Nicosulfuron&rimsulfuron, nicosulfuron, and foramsulfuron provided excellent VC control. VC control with mesotrione and dicamba&diflufenzopyr dropped 9-18% with the 6-leaf application, while control with 2,4-D amine dropped 15-43%. Fluroxypyr and atrazine provided poor to fair control.
Handout (.pdf format, 105.0 kb)