Few options are available for controlling bermudagrass invasion of seashore paspalum. Bermudagrass and seashore paspalum tolerance to topramezone, triclopyr, or the combination of these two herbicides were evaluated in both greenhouse and field conditions. Field treatments included two sequential applications of topramezone (15.6 g ai ha−1) alone and five rates of topramezone + triclopyr (15.6 + 43.2, 15.6 + 86.3, 15.6 + 172.6, 15.6 + 345.2, or 15.6 g ai ha−1 + 690.4 g ae ha−1). Secondary greenhouse treatments included a single application of topramezone (20.8 g ha−1) or triclopyr (258.9 g ha−1) alone, or in combination at 20.8 + 258.9 or 20.8 + 517.8 g ha−1, respectively. Greenhouse and field results showed that topramezone applications in combination with triclopyr present opposite responses between bermudagrass and seashore paspalum. Topramezone increased bermudagrass injury and decreased seashore paspalum bleaching injury compared to topramezone alone. In field evaluations, topramezone + triclopyr at 15.6 + 690.4 g ha−1 used in sequential applications resulted in >90% injury to bermudagrass, however, injury decreased over time. Furthermore, sequential applications of topramezone + triclopyr at 15.6 + 690.4 g ha−1 resulted in >50% injury to seashore paspalum. Application programs including topramezone plus triclopyr should increase bermudagrass suppression and reduce seashore paspalum injury compared to topramezone alone. However, additional studies are needed because such practices will likely require manipulation of topramezone rate, application timing, application interval, and number of applications in order to maximize bermudagrass control and minimize seashore paspalum injury.

中文翻译：

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海滨雀稗和狗牙根对topramezone和绿草定混合物的响应

很少有选择可用于控制狗牙根入侵海滨雀稗。在温室和田间条件下评估了狗牙根和海滨雀稗对 topramezone、绿草定或这两种除草剂组合的耐受性。田间处理包括两次连续施用 topramezone (15.6 g ai ha-1) 单独和五倍速唑草酮 + 绿草定 (15.6 + 43.2、15.6 + 86.3、15.6 + 172.6、15.6 + 345.2 或 15.6 g ai ha-1+ 690.4 克·哈-1）。二次温室处理包括单次施用 topramezone（20.8 g ha-1) 或绿草定 (258.9 g ha-1) 单独使用，或以 20.8 + 258.9 或 20.8 + 517.8 g ha 组合使用-1， 分别。温室和田间结果表明，topramezone 与绿草定的组合应用在狗牙根和海滨雀稗之间表现出相反的反应。与单独使用topramezone 相比，Topramezone 增加了狗牙根损伤并减少了海滨雀稗漂白损伤。在现场评估中，15.6 + 690.4 g ha 的 topramezone + 绿草定-1在连续应用中使用对狗牙根造成 >90% 的伤害，然而，伤害随着时间的推移而减少。此外，在 15.6 + 690.4 g ha-1对海滨雀稗造成 >50% 的伤害。与单独使用topramezone 相比，包括topramezone 加绿草定在内的应用程序应增加对狗牙根的抑制并减少海滨雀稗损伤。然而，需要进行额外的研究，因为这样的做法可能需要控制 topramezone 的施用率、施用时间、施用间隔和施用次数，以最大限度地控制狗牙根和减少海滨雀稗的伤害。