In case anyone is still interested in this:
Crabgrass is an annual and so it's easy to control by disrupting the seed germination. The big box store pre-emergent is wimpy, super-expensive and needs to be re-applied about every 3 months. Get yourself a jug of prodiamine off Amazon for ~$55 and spray at recommended rates. Not only is it super effective, it's about 50 times less expensive per thousand than home improvement store stuff.
Prodiamine will take care of 99.5% of the crabgrass before it germinates. There will still be some where animals dig and the pre-emergent barrier gets broken. For that, you will need a bottle of quinclorac and a bottle or methylated seed oil. Quinclorac/MSO is very very effective on crabgrass.
Once you disrupt the seed cycle for 2-3 years, you can even skip a year or two o the pre-emergent since the seed bank has been exhausted.
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