I haven't had very good luck with that Ortho Crabgrass killer spray
either. I will say that last year I had Crabgrass worse than I have
this year. Last Summer, I pulled it all out, and then sprayed any
little sprouts that would come up after that.

I put a pre-emergent on the lawn this April. . .I have much less of it
this year.

Myrl Jeffcoat
http://www.myrljeffcoat.com