Any ideas what this is getting into my lawn. It started last summer
and it really took hold this spring (northern Ohio). Weed killer has
been no help. Kinda looks like a very coarse grass but crab grass
preventer does not affect it. How to kill this stuff without
replanting the whole lawn?

http://tinypic.com/4szipi
http://tinypic.com/4szj45
http://tinypic.com/4sziwm
http://tinypic.com/4szity

Thanks.