I have been using a lawn service for the past few months in an attempt to restore the lawn that was neglected by the previous home owner. They have been able to remove most of the bigger weeds and clover in the lawn, however, with the limited amount of grass established crab grass has taken over (80% of the lawn). Next month, I am scheduled to have the lawn aerated and over seeded. Will this process do much considering the amount of crab grass established? Would it be wise to cancel the service and just spend the extra money and apply roundup and reseed the lawn?

Thanks