Despite all my efforts to attack crabgrass before it emerged in early spring, I still have quite more of it than I would like. I did the pre-emergent treatment(s) and it seemed to make very little difference. One issue I think I have is that the past winter did not kill the crabgrass. It just withered a bit but came back again. Therefore I think alot of my crabgrass is more than one year old. I used alot of post-emergent killer last year, and it killed some of it but not all. And I think it had a detrimental effect on my "good" grass. I understand that post-emergent crabgrass killer will kill good grass if applied too heavily. So what are my options.. Pulling it out is not completely practical, although I believe it would work in smaller areas. In some patches (20' x 20') almost all the grass is crab, so pulling it or killing it would really mean starting over in that area. Any suggestions are appreciated.