I have a 9 year old lawn that I hire a professional to handle fertilization and weedkilling. Overall I am very happy with my lawn care company, however this is the first year that I am seeing large spots of very thick patches of wide bladed, light color grass among the darker narrow bladed grass. I much prefer the narrow darker grass. My lawn guy came and applied a weed killer that seemed to take care of any crabgrass I had around, but barely touched these thick patches. I have uploaded some pictures in hopes that someone can tell me what species this is that is invading my pride and joy. I did install a sprinkler system this year, but the patches are not necessarily where the pre-emergent was disturbed. Thanks in advance for the help!