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I have been fighting that pest for years. The only way to really get rid of it is multiple applications of a pre-emergent herbicide in the early spring. Normally, the actual plant is killed off by the first freeze. The plants of course leave seeds waiting to germinate in the spring. The pre-emergent prevents the seeds from germinating (also any grass seeds you have put down). Once it is up and growing it is near impossible to kill off, normal herbicides don't touch it. Roundup is a little extreme, as it will kill everything else as well.
This past spring I really hit it hard with Scott's Halts, and no crabgrass this year. I have other weird weeds but no crabgrass.
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