Many factors such as environment, herbicide rate, growth stage at application, and days between sequential applications can influence the response of a crop to herbicides. Florpyrauxifen-benzyl is a new broad-spectrum, POST herbicide that was commercialized for use in U.S. rice production in 2018. Field experiments were conducted in 2018 at the Pine Tree Research Station (PTRS) near Colt, AR, and the Rice Research and Extension Center (RREC), near Stuttgart, AR, to evaluate crop injury and yield response of three rice cultivars to sequential applications of florpyrauxifen-benzyl. Greenhouse and growth chamber experiments were conducted at the Altheimer Laboratory in Fayetteville, AR, to evaluate cultivar responses when florpyrauxifen-benzyl was applied at 30 or 60 g ae ha−1 to rice exposed to different temperature regimes or at various growth stages. Three rice cultivars were used in all experiments: long-grain variety ‘CL111’, medium-grain variety ‘CL272’, and long-grain hybrid cultivar ‘CLXL745’. CL111 exhibited sufficient tolerance to florpyrauxifen-benzyl with only 10% visible injury and no effect on yield. CL272 showed 15% injury 3 wk after the second application in the field experiment when applications were made 14 d apart. Additionally, 12% injury was observed in greenhouse studies when florpyrauxifen-benzyl was applied at 30 g ae ha−1, averaged over various growth stages at application. Florpyrauxifen-benzyl did not reduce the yield of CL272 in field experiments, indicating that CL272 can recover from florpyrauxifen-benzyl injury. As much as 64% injury was observed for CLXL745 at 3 wk after application (WAA) when sequential herbicide applications were made 4 d apart. High levels of injury occurred in the growth chamber and greenhouse studies for this cultivar as well. Sequential applications of florpyrauxifen-benzyl reduced yields of CLXL745 in nearly all treatments. Data from these experiments suggest that CL272 and CLXL745 are sensitive to sequential applications of florpyrauxifen-benzyl. Growers must follow the prescribed guidelines for using florpyrauxifen-benzyl in these cultivars and others like it.

中文翻译：

---

水稻品种对氟吡草醚-苄基反应的表征

许多因素，如环境、除草剂用量、施用时的生长阶段以及连续施用之间的天数都会影响作物对除草剂的反应。Florpyrauxifen-benzyl 是一种新的广谱 POST 除草剂，于 2018 年商业化用于美国水稻生产。2018 年在阿肯色州柯尔特附近的松树研究站 (PTRS) 和水稻研究与推广中心进行了田间试验中心 (RREC) 位于阿肯色州斯图加特附近，旨在评估三种水稻品种对连续施用氟吡唑醚苄基的作物损伤和产量反应。温室和生长室实验在阿肯色州费耶特维尔的 Altheimer 实验室进行，以评估在 30 或 60 g ae ha 施用氟吡唑苯苄时的栽培品种反应-1对暴露于不同温度条件或处于不同生长阶段的水稻。在所有实验中使用了三个水稻品种：长粒品种'CL111'、中粒品种'CL272'和长粒杂交品种'CLXL745'。CL111 对 florpyrauxifen-benzyl 表现出足够的耐受性，只有 10% 的可见损伤且对产量没有影响。CL272 在田间实验中的第二次施用后 3 周显示 15% 的伤害，当施用间隔 14 天时。此外，在温室研究中，当以 30 g ae ha 施用 florpyrauxifen-benzyl 时，观察到 12% 的伤害-1,应用时各个生长阶段的平均值。在田间试验中，吡唑醚菌酮不会降低 CL272 的产量，说明 CL272 可以从吡唑醚菌素损伤中恢复。当连续除草剂应用相隔 4 天时，CLXL745 在施用后 3 周（WAA）观察到高达 64% 的伤害。在该品种的生长室和温室研究中也发生了高水平的损伤。在几乎所有处理中连续应用氟吡唑醚-苄基降低了 CLXL745 的产量。来自这些实验的数据表明 CL272 和 CLXL745 对氟吡草醚-苄基的顺序应用敏感。种植者必须遵循在这些品种和其他类似品种中使用 florpyrauxifen-benzyl 的规定指南。