On Sun, 4 Jul 2010 14:00:56 -0700 (PDT), hr(bob)
wrote:
I have the invasive grass/weed shown in the picture in many places in
my lawn. The spots of weeds pop up with no apparent source. They do
no respond to weed killer, and they crowd out regular lawn grass. I
am in the Chicago suburbs. Can anyone tell me what the grayish green
grass/weed is and how to get rid of it?

http://www.flickr.com/photos/bobhofmann/4761771580/

Not enough detail for an accurate diagnosis, but I suspect it's crabgrass,
an annual. If so, your choices are mowing practices and fertilizer or
chemical warfare.

Mowing/Fertilizer:
http://answers.yahoo.com/question/in...4130305AAOLW1G
http://urbanext.illinois.edu/lawntal...home_lawns.cfm

ID: http://www.garden-counselor-lawn-car...-pictures.html
http://www.purdue.edu/envirosoft/law...t/herbici3.htm

Kay