Identify Weed/Grass

Last fall I took my yard down to bare ground, re-seeded and strawed it. I guess the straw had some weed/grass seed in it.
I have a good stand of fescue but it's now being taken over by this stuff. (see picture at "Identify Weed/Grass" in
I live in Southern Illinois close to St. Louis, MO.
Can anyone tell me what this is and how to get rid of it.
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