I talked with a customer that has a very nice bluegrass/ryegrass lawn that is being overtaken by zoisia grass in patches. He has a few patches, 4'x4' that are very noticable, and some others that are only visible upon close inspection. The problem is that we don't know where all the tiny patches of zosia are.<p>He would like to completely rid the lawn of the zoisia grass. What is the best way to do this? I was thinking along the lines of roundup over the whole infected area, then re-seed. He also thinks that we should perhaps physcally remove the larger patches of zoisia by digging them out with a shovel, and filling the depressions with some topsoil. <p>So, what would be the best way to completely rid the lawn of the zoisia? Do we need to go in with a sod cutter, and start from scratch, or can we kill off all the existing turf, and overseed? <p>BTW I believe that the zoisia came from a neighboring lawn, down over a slight hill.