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Herbicidal Control of Tall Larkspur

  • Paul J. Torell (a1) and Robert H. Haas (a2) (a3)


Herbicidal control of tall larkspur, Delphinium occidentale Wats. was investigated in the Sawtooth National Forest near Oakley, Idaho. When larkspur was in a prebud stage, 4 and 8 lb/A of the propylene glycol butyl ether esters of 2-(2,4,5-trichlorophenoxy)propionic acid (silvex) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) gave good control, with significant increases in yield of native grasses. At the bud and flower stages neither herbicide gave satisfactory control at 12 lb/A. Granular silvex at 400 lb/A total product (80 lb/A ae) killed all larkspur with only slight injury to rabbitbrush, sagebrush, and native grasses. A chlorate-borate (25%–75%) mixture gave a complete larkspur kill at 1740 lb/A.



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Herbicidal Control of Tall Larkspur

  • Paul J. Torell (a1) and Robert H. Haas (a2) (a3)


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