Fomesafen: spray volume and adjuvants

摘要

The experiment was conducted to examine the influence of spray volume and adjuvants on fomesafen(Flexstar~R) efficacy. Oilseed sunflower, ‘Neche’ flax, and ‘Mancan’ tame buckwheat were planted as 6-ftwidestrips side-by-side on May 25, 2003, near Fargo, ND. Plots 12 ft wide were laid out perpendicular tothe strips so that each plot contained all three assay species. Treatments were applied on July 2 with anall-terrain vehicle equipped with a four-nozzle boom (20-inch spacing) offset to one side. All treatmentswere applied at 20 psi. Spray volumes at 2.5 and 5 gpa were applied with Turbo TeeJet 11001 nozzlesand at 10 and 20 gpa were applied with Turbo TeeJet 11004 nozzles, and speed was adjusted to applythe correct volume with each nozzle. Conditions at treatment were 76 F, 75% RH, wind 8-10 mph, andsky 20% clouds. Sunflower was 8- to 12-inch, flax 8- to 12-inch, and buckwheat 8- to 15-inch.Experimental design was a randomized complete block with four replicates. Weed control was evaluatedvisually where 0 equaled no visible injury and 100 equaled complete control of assay species.