The butoxyethyl ester of triclopyr {[(3,5,6-trichloro-2-pyridinyl)oxy] acetic acid} was more effective than either the triethylamine salt formulation or an equivalent combined rate of the butoxyethyl esters of triclopyr plus 2,4-D [(2,4-dichlorophenoxy)acetic acid] (1:2, w/w) for the control of Virginia creeper [Parthenocissus quinquefolia (L.) Planch. # PRTQU]. Carrier volume did not affect 14C-triclopyr absorption and distribution, but control generally was greater after high carrier-volume application (281 L/ha) because the dense Virginia creeper canopy was thoroughly penetrated. In orchards, Virginia creeper was controlled by triclopyr ester at 0.6 kg ae/ha through the second season after treatment if foliage was covered thoroughly.
