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you have something other than crabgrass, because crabgrass has not germinated yet...........are you sure its not bermuda grass?
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My first thought as well but since James is in zone 4 he shouldn't have any grass yet. I'm no turf expert but I'm guessing you're looking at last years dead crabgrass?
You can either wait and kill the whole thing in the summer and start over at the end of the summer or you could try preemergent and see what comes up. If you get good control with the pre em you can slice seed when it's time. Whatever you do make sure they know that they will need to continue with a pre-em in spring to keep it from coming back.