Florpyrauxifen-benzyl and quizalofop were available for POST applications in 2018; however, little is known about the response of acetyl-CoA carboxylase (ACCase)–resistant rice cultivars and advanced lines to POST herbicides. A field study was conducted in 2017 and 2018 at Stoneville, MS, to characterize the response of ACCase-resistant rice cultivars and advanced lines to POST applications of florpyrauxifen-benzyl. The imidazolinone-resistant (IR) rice cultivars ‘CL163’ and ‘CLXL 745’, and ACCase-resistant rice cultivars ‘PVL01’, ‘PVL013’, ‘PVL024-B’, ‘PVL038’, ‘PVL080’, and ‘PVL081’were treated with florpyrauxifen-benzyl at 0 (nontreated control for each cultivar) and 58 g ai ha–1 at the four-leaf to one-tiller (LPOST) growth stage. At 14 d after treatment (DAT), PVL01 was injured 5% to 6% greater than CLXL 745, PVL013, and PVL081; however, injury was ≤10% at that evaluation for all cultivars. Similarly, injury was ≤13% for all cultivars 28 DAT. Mature heights were reduced for all cultivars except PVL013 and PVL081. Rough rice yield was ≥100% of the control for all cultivars except PVL081, PVL013, and CL163. Results suggest that florpyrauxifen-benzyl can safely be applied POST to rice cultivars grown in Mississippi as well as ACCase-resistant cultivars that are currently under development.

中文翻译：

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抗乙酰辅酶A羧化酶水稻品种和先进品系对氟吡草醚苄基的响应

Florpyrauxifen-benzyl 和 quizalofop 于 2018 年可用于 POST 应用；然而，关于乙酰辅酶A羧化酶（ACCase）抗性水稻品种和先进品系对POST除草剂的反应知之甚少。2017 年和 2018 年在密西西比州斯通维尔进行了一项田间研究，以描述抗 ACCase 水稻品种和先进品系对氟吡唑苯苄酯 POST 应用的反应。抗咪唑啉酮 (IR) 水稻品种“CL163”和“CLXL 745”，以及抗 ACCase 水稻品种“PVL01”、“PVL013”、“PVL024-B”、“PVL038”、“PVL080”和“PVL081”用 0（每个栽培品种的未处理对照）和 58 g ai ha 的 florpyrauxifen-benzyl 处理–1在四叶到一分蘖 (LPOST) 生长阶段。治疗后 14 d (DAT)，PVL01 的损伤比 CLXL 745、PVL013 和 PVL081 大 5% 至 6%；然而，在所有品种的评估中，伤害≤10%。同样，所有品种 28 DAT 的损伤≤13%。除 PVL013 和 PVL081 外，所有品种的成熟高度均有所降低。除 PVL081、PVL013 和 CL163 外，所有品种的糙米产量均≥对照的 100%。结果表明，氟吡唑苯醚可以安全地应用于密西西比州种植的水稻品种以及目前正在开发的抗 ACCase 品种。