Selective Post-Emergence Control of Oxalis corniculata in Cymbidium hybrida

This investigation was performed to determine the effectiveness of selective post-emergent herbicides for control of Oxalis corniculata L., creeping woodsorrel in container grown cymbidium orchids. Triclopyr, [(3,5,6-trichloro-2-pyridimyl)oxy] acetic acid, (Turflon) and 2,4-D Amine, (2,4-dichlorophenoxy)acetic acid (Weedar 64) were applied as spot and broadcast treatments. Weed and crop phytotoxicity were monitored. Turflon (Triclopyr) at 1.12 kg/ha (1.0 lb ai/A) provided complete oxalis control with both spot and broadcast treatments. No crop phytotoxicity was noted. Weedar 64 (2,4-D amine) spot treated at 4 gm ai/l reduced oxalis populations by 60% after 8 weeks, with no observed crop injury.