Definitely some type of Rush. Any type of glyphosate herbicide should do the job like Shorekill.
Cecil: Have you ever used glyphosate (successfully) to control a rush species (bulrush / Scirpus spp)? Just wondered, since my attempts with glyphosate weren't successful; likewise with imazapyr.
On the other hand, 2,4-D and triclopyr did an excellent job - which goes against conventional wisdom since these two active-ingredients are typically effective only on broadleaf species.
