Controlling Sprout Clumps of Bigleaf Maple with Herbicides and Manual Cutting

Abstract

Abstract Bigleaf maple (Acer macrophyllum) clumps were controlled using the herbicides glyphosate, imazapyr, metsulfuron methyl, triclopyr amine, triclopyr ester, and 2,4-DP + 2,4-D; by basal spray, thinline, foliage spray, and on cut surfaces; during early foliar, late foliar, and dormant periods on five sites across western Oregon and Washington. Three timings of manual cutting alone also were compared. Imazapyr foliage sprays, triclopyr ester thinline, dormant 3% triclopyr ester basal spray, late-foliar 2, 4-DP + 2,4-D basal spray, and manual cutting with triclopyr amine cut-surface application provided the best control among the treatments tested over the 3 yr of study. Imazapyr foliage sprays provided the best long-term control by killing most treated clumps. Triclopyr ester thinline treatments provided the most consistent and effective results among the basal applications. Stump applications of triclopyr amine were more effective than manual cutting alone or manual cutting with glyphosate cut-surface application. West. J. Appl. For. 9(4):118-124.