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Proceedings of the International Plant Propagator's Society

Vol. 50

Postemergence Spurge Control in Container-Grown Liriope

James E. Altland, Charles H. Gilliam and John W. Olive

pp: 466-472

Three experiments were conducted to evaluate postemergence applied herbicides for prostrate spurge [Chamaesyce maculata (syn. Euphorbia supina)] control and tolerance of container-grown liriope (Liriope muscari). In experiment 1, Manage at 0.0084, 0.017, or 0.034 kg ai ha-1 (0.0075, 0.015, or 0.03 lb ai ac-1); Image at 0.07, 0.14, or 0.28 kg ai ha-1 (0.0625, 0.125, or 0.25 lb ai ac-1); Trimec Southern at 0.64, 1.28, or 2.56 kg ai ha-1 (0.57, 1.14, or 2.28 lb ai ac-1); and Roundup at 0.11, 0.22, or 0.45 kg ai ha-1 (0.1, 0.2, or 0.4 lb ai ac-1) were applied to 10.2-cm(4-inch) liners of ‘Big Blue’ liriope infested with prostrate spurge. Only Roundup at 0.45 kg ai ha-1 (0.4 lb ai ac-1) provided effective postemergence spurge control (96%) and caused no short-term or long-term injury to ‘Big Blue’. In Experiment 2, Finale at 0.28, 0.56, or 1.12 kg ai ha-1 (0.25, 0.5, or 1.0 lb ai ac-1), and Roundup at 0.45, 0.9, or 1.8 kg ai ha-1 (0.4, 0.8, or 1.6 lb ai ac-1) were applied to ‘Variegata’ liriope infested with mature spurge. Finale at 1.12 kg ai ha-1 (1.0 lb ai ac-1) and Roundup at 1.8 kg ai ha-1 (1.6 lb ai ac-1) provided effective spurge control (100 and 92.8%, respectively) and caused no short-term injury to ‘Variegata’. In Experiment 3, the same rates used in Experiment 2 were applied to either small [2.5 to 10.1 cm (1 to 8 inches)] or large [24.4 to 38.1 cm (10 to 15 inches)] spurge to determine if larger spurge are more difficult to control. Finale at 0.56 and 1.12 kg ai ha-1 (0.5 and 1.0 lb ai ac-1) provided excellent control of small nonflowering spurge, but there was a decline in control of large-flowering spurge. Roundup at 0.9 and 1.8 kg ai ha-1 (0.8 and 1.6 lb ai ac-1) provided good control of large and small spurge (91% to 100%).

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