Waterhyacinth [Eichhornia crassipes (Mart.) Solms] has been the focus of national legislation efforts and has been listed as noxious, invasive, potentially invasive, or prohibited by at least seven U.S. states. Auxinic herbicides are one of the most effective control methods labeled for use in aquatic sites. In the United States, florpyrauxifen-benzyl, a synthetic auxin, was recently (2018) registered for use in aquatic sites, but limited information has been published on efficacy, especially differences between the two formulations. Therefore, the purpose of this work was to evaluate two formulations of florpyrauxifen-benzyl—suspension concentrate (SC) and emulsifiable concentrate (EC)—at three rates each (14.8, 29.5, and 58.9 g ai ha−1) for control of E. crassipes under outdoor and greenhouse conditions. All rates of each florpyrauxifen-benzyl formulation reduced E. crassipes biomass by 90% to 100% when compared with nontreated plants at 5 wk after treatment. Based on plant recovery in the outdoor trial, there was some evidence that the lowest rate (14.8 g ai ha−1) of florpyrauxifen-benzyl SC and EC may not be as efficacious at reducing E. crassipes biomass as the SC and EC formulations when applied at 29.5 and 58.9 g ai ha−1. Future work should evaluate the florpyrauxifen-benzyl rates tested in this research against E. crassipes in field trials and/or an operational setting to confirm findings.

中文翻译：

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在中宇宙环境中氟吡草醚-苄基制剂和速率对水葫芦 (Eichhornia crassipes) 控制的影响

水葫芦 [凤眼莲(Mart.) Solms] 一直是国家立法工作的重点，并已被美国至少七个州列为有害、侵入性、潜在侵入性或禁止的。生长素除草剂是标记用于水生场所的最有效控制方法之一。在美国，合成生长素 florpyrauxifen-benzyl 最近（2018 年）注册用于水生场所，但关于功效的信息有限，特别是两种配方之间的差异。因此，这项工作的目的是评估两种氟吡草醚-苄基制剂 - 悬浮剂 (SC) 和乳油 (EC) - 分别以三种比率（14.8、29.5 和 58.9 g ai ha-1) 用于控制E. crassipes在室外和温室条件下。每种氟吡草醚-苄基制剂的所有比率均降低E. crassipes处理后 5 周，与未经处理的植物相比，生物量增加了 90% 至 100%。根据户外试验的植物恢复情况，有证据表明最低比率（14.8 g ai ha-1) florpyrauxifen-benzyl SC 和 EC 在减少E. crassipes以 29.5 和 58.9 g ai ha 施用时作为 SC 和 EC 配方的生物质-1. 未来的工作应评估本研究中测试的 florpyrauxifen-benzyl 比率E. crassipes在现场试验和/或操作环境中确认结果。