OK, so I have now figured out I have poa annua problem in the otherwise good lawn. Section of approx 75% poa annua is approx 200 sq ft. Here is what I was thinking for renovation/control. In this order. Late Sept....Outline the area...apply Roundup to everything.....allow to die....apply Dimension.....put a layer of topsoil approx 1/2 inch to the area...roll seed into the layer of top. Does this make any sense...? Any suggestions/comments appreciated.