POST goosegrass and other grassy weed control in bermudagrass is problematic. Fewer herbicides that can control goosegrass are available due to regulatory pressure and herbicide resistance. Alternative herbicide options that offer effective control are needed. Previous research demonstrates that topramezone controls goosegrass, crabgrass, and other weed species; however, injury to bermudagrass may be unacceptable. The objective of this research was to evaluate the safening potential of topramezone combinations with different additives on bermudagrass. Field trials were conducted at Auburn University during summer and fall from 2015 to 2018 and 2017 to 2018, respectively. Treatments included topramezone mixtures and methylated seed oil applied in combination with five different additives: triclopyr, green turf pigment, green turf paint, ammonium sulfate, and chelated iron. Bermudagrass bleaching and necrosis symptoms were visually rated. Normalized-difference vegetative index measurements and clipping yield data were also collected. Topramezone plus chelated iron, as well as topramezone plus triclopyr, reduced bleaching potential the best; however, the combination of topramezone plus triclopyr resulted in necrosis that outweighed reductions in bleaching. Masking agents such as green turf paint and green turf pigment were ineffective in reducing injury when applied with topramezone. The combination of topramezone plus ammonium sulfate should be avoided because of the high level of necrosis. Topramezone-associated bleaching symptoms were transient and lasted 7 to 14 d on average. Findings from this research suggest that chelated iron added to topramezone and methylated seed oil mixtures acted as a safener on bermudagrass.

中文翻译：

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使用螯合铁和其他添加剂减少百慕大对百慕大草的伤害

在百慕大草中的 POST 鹅草和其他禾本科杂草控制是有问题的。由于监管压力和除草剂抗性，可控制鹅草的除草剂较少。需要提供有效控制的替代除草剂选择。先前的研究表明，topramezone 可以控制鹅草、马唐和其他杂草。然而，对狗牙根的伤害可能是不可接受的。本研究的目的是评估与不同添加剂的 topramezone 组合对狗牙根的安全潜力。田间试验分别于 2015 年至 2018 年和 2017 年至 2018 年夏季和秋季在奥本大学进行。处理包括与五种不同添加剂组合施用的topramezone混合物和甲基化种子油：绿草定、绿色草皮颜料、绿色草皮漆、硫酸铵和螯合铁。目视评价狗牙根白化和坏死症状。还收集了标准化差异植物指数测量和修剪产量数据。Topramezone加螯合铁，以及topramezone加绿草定，降低漂白潜力最好；然而，topramezone 和绿草定的组合导致的坏死超过了漂白的减少。与topramezone一起使用时，绿色草坪涂料和绿色草坪颜料等掩蔽剂在减少伤害方面无效。由于坏死程度高，应避免托普美松与硫酸铵的组合。Topramezone 相关的漂白症状是短暂的，平均持续 7 至 14 天。