Looks like you have tall Fescue grass.
yellowbasterd hit the nail on the head.
Although if you put down the crabgrass perventer in feb/march it's ok. (After march it's too late)
I prefer preen or scotts
http://www.preen.com/products/lawns/lawn-weed-control
http://www.scotts.com/smg/catalog/pr...temId=cat50044
Never water at nite:nono
leads to fungus growth or mold)
Do not fertilize during the summer months.
If you really want fertilize during the summer months use a product called "ironite".