Downy brome (Bromus tectorum) is one of the most problematic invasive plant species in the United States. Downy brome invasions are associated with reductions in diversity and an increase in fire intensity. Bioherbicides that are reported to effectively control downy brome have been developed. Pseudomonas fluorescens strain D7 is one such bioherbicide that is of significant interest to land managers in Wyoming. A spatially replicated field trial was performed to identify what effect D7 has on downy brome in Wyoming. The field trial showed no response of any downy brome fitness metrics to D7; only commonly used synthetic herbicides were able to reduce downy brome cover. This work suggested D7 may not be a viable product for downy brome control, or more information may be needed about the field conditions required for a positive result when using D7.

霜霉病（Bromus tectorum）是美国最有问题的入侵植物之一。霜霉病菌入侵与物种减少和火势增加有关。据报道已开发出可有效控制霜霉病的生物除草剂。荧光假单胞菌D7株是一种这样的生物除草剂，怀俄明州的土地管理者对此非常感兴趣。进行了一项空间复制的田间试验，以确定D7对怀俄明州霜霉病的影响。现场试验表明，对D7没有任何霜霉病适应度指标的反应；只有常用的合成除草剂才能减少霜霉病。这项工作表明D7可能不是控制霜霉病的可行产品，或者使用D7时可能需要更多有关获得阳性结果所需的田间条件的信息。