I know this is the most basic of questions, but as a first time homeowner I want to make sure I'm identifying this correctly and do the right thing to fight it. I believe it to be crabgrass, correct? If so I have two questions:
What did I do wrong? I put down Scotts Turfbuilder with Halts crabgrass preventer in the spring. Up until a couple weeks ago, I hadn't seen any crabgrass in my lawn, now it's popped up in all the weak spot of my lawn; mostly near the edge of my driveway and in a few spots where trees were removed last year and the grass won't grow. Should I have done two applications of Halts?
What do I do now? I know it's too late for preemergent...do I still put some down to prevent new growth AND apply a post emergent? I spot sprayed with weed b gon today...do I need to be more aggressive and put something over my whole lawn?