Postemergence Prostrate Spurge (Chamaesyce prostrata) Control in Container-Grown Liriope

Abstract Four experiments were conducted to evaluate herbicides for postemergence prostrate spurge (Chamaesyce prostrata (syn. Euphorbia prostrata)) control and tolerance of container-grown liriope (Liriope muscari). In Experiment 1, Manage, Image, Trimec Southern, and Roundup were applied at three rates each to single bib liners of ‘Big Blue’ liriope in 10.2 cm (4 in) pots. Pots were infested with prostrate spurge that were 1 to 2 cm (0.4 to 0.8 in) wide with no flower or seed structures. Only Roundup at 0.45 kg ai/ha (0.4 lb ai/A) provided effective postemergence spurge control (96%) and caused no short-term or long-term injury to ‘Big Blue’. In Experiment 2, Finale and Roundup were applied at three rates each to established ‘Big Blue’ in 3.8 liter (1 gal) containers. By 21 DAT, Finale at rates of 0.28 kg ai/ha (0.25 lb ai/A) or greater caused slight though significant injury to ‘Big Blue’ while Roundup caused no injury. No injury was observed on any plant at 60 DAT and the following spring, growth was ...