Pinoxaden is a POST acetyl coenzyme A carboxylase (ACCase) inhibitor in the phenylpyrazolin chemical family and is labelled for turfgrass use at broadcast rates of 35.5 to 71 g ai ha−1 and spot spray rates of 156 to 310 g ai ha−1. A greenhouse rate-response study was conducted to characterize the efficacy of pinoxaden against common grassy weeds. Weed species examined in this study were yellow foxtail, southern sandbur, annual bluegrass, roughstalk bluegrass, large crabgrass, dallisgrass, bahiagrass, goosegrass, and perennial ryegrass. Nonlinear regressions were modelled to determine visible injury rates (the application rate at which 50% of the weed species were injured and the 90% [I90] rate) and weight reduction rates (the application rate at which there was a 50% reduction in fresh weight and 90% reduction [WR90]) for each weed species. Only annual bluegrass, bahiagrass, and goosegrass had visible injury I90 values greater than the maximum labelled spot spray rate of 310 g ai ha−1. Annual bluegrass, bahiagrass, southern sandbur, and goosegrass all had WR90 values greater than the maximum labelled spot spray rate of 310 g ai ha−1. Results from this study indicate that the evaluated weed species can be ranked, according to visible injury I90 values, from most to least susceptible: perennial ryegrass > yellow foxtail > dallisgrass > large crabgrass > southern sandbur > roughstalk bluegrass > bahiagrass > goosegrass > annual bluegrass.

中文翻译：

---

精选禾本科杂草对吡诺沙丁的速率响应

Pinoxaden 是一种 POST 乙酰辅酶 A 羧化酶 (ACCase) 抑制剂，属于苯基吡唑啉化学家族，被标记为在 35.5 至 71 g ai ha 的播撒率下用于草坪草-1点喷量为 156 至 310 g ai ha-1. 进行了温室速率反应研究，以表征吡诺沙丁对常见禾本科杂草的功效。本研究中检查的杂草种类有黄狐尾草、南沙巴、一年生早熟禾、粗茎早熟禾、大马唐、dallisgrass、bahiagrass、鹅草和多年生黑麦草。对非线性回归建模以确定可见伤害率（50% 的杂草物种受到伤害的施用率和 90% [I90] 率）和减重率（鲜重减少 50% 和减少 90% 的施用率 [WR90]) 用于每种杂草。只有一年生早熟禾、巴伊亚草和鹅肝草有明显的损伤 I90值大于 310 g ai ha 的最大标记点喷洒率-1. 一年生早熟禾、巴伊亚草、南沙柏和鹅草都具有 WR90值大于 310 g ai ha 的最大标记点喷洒率-1. 这项研究的结果表明，评估的杂草种类可以根据可见损伤 I 进行排序90值，从最敏感到最不敏感：多年生黑麦草 > 黄狐尾 > dallisgrass > 大马唐 > 南沙棘 > 粗茎早熟禾 > 巴伊亚草 > 鹅草 > 一年生早熟禾。