You are on the right track!
Add Pre-m to round two at half rate to get extended control.
Example: Round one
1/2 lb. N @ 4lb. rate
3-way ester spot spray winter annuals
1/3 lb. N
2 lb. rate Pre-m
Momentum @1.1 oz. rate
That would get you season long control.
If its too late for Pre-m use, Dimension will kill young crabgrass and prevent new seedlings.
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mount airy, md 21771-0630