M. A. FERRELL and T. D. WHITSON
Leafy spurge is a major broadleaf, perennial weed problem in rangeland. This re-search was conducted in Crook County, WY, to compare the efficacy of dicamba combi-nations, with picloram and 2,4-D LVE, on leafy spurge.
Plots were established May 14, 1986 to a dense stand of leafy spurge in a rangeland setting. The leafy spurge was in the prebud stage-of-growth. Perennial grasses 4 to 6 inches tall were present as an understory. Herbicides were applied with a 6-nozzle knap-sack spray unit with a carrier volume of 40 gpa delivered at 40 psi pressure through 8004 flat fan nozzles. Weather conditions were as follows: air temp. 45º F, relative humidity 60%, wind SW at 5 mph, sky cloudy, and a soil temp. œ 0 inch 60º F, 1 inch 54º F, 2 inch 50º F, 4 inch 50º F. Soil was silt loam (22% sand, 58% silt and 20% clay) with 1.8% or-ganic matter and 6.3 pH. Plots were 9 by 30 feet and arranged in a randomized complete block design with four replications.
Visual evaluations were made May 14, 1987. Picloram at 2.0 lb ai/A was the only ef-fective treatment. Combinations of dicamba with picloram and 2,4-D LVE were not ef-fective in controlling leafy spurge. (Wyoming Agric. Exp. Sta., Laramie, WY 82071, SR 1517.)
Leafy spurge is a major broadleaf, perennial weed problem in rangeland. This re-search was conducted in Crook County, WY, to compare the efficacy of dicamba combi-nations, with picloram and 2,4-D LVE, on leafy spurge.
Plots were established May 14, 1986 to a dense stand of leafy spurge in a rangeland setting. The leafy spurge was in the prebud stage-of-growth. Perennial grasses 4 to 6 inches tall were present as an understory. Herbicides were applied with a 6-nozzle knap-sack spray unit with a carrier volume of 40 gpa delivered at 40 psi pressure through 8004 flat fan nozzles. Weather conditions were as follows: air temp. 45º F, relative humidity 60%, wind SW at 5 mph, sky cloudy, and a soil temp. œ 0 inch 60º F, 1 inch 54º F, 2 inch 50º F, 4 inch 50º F. Soil was silt loam (22% sand, 58% silt and 20% clay) with 1.8% or-ganic matter and 6.3 pH. Plots were 9 by 30 feet and arranged in a randomized complete block design with four replications.
Visual evaluations were made May 14, 1987. Picloram at 2.0 lb ai/A was the only ef-fective treatment. Combinations of dicamba with picloram and 2,4-D LVE were not ef-fective in controlling leafy spurge. (Wyoming Agric. Exp. Sta., Laramie, WY 82071, SR 1517.)
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