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Then get the roundup that kills the weeds but not grass. Or just pull it out. Thankfully crab grass is an annul and will die off come fall and winter. Just remember to put down a pre emergent next spring.
Note: Round-up(glyphosate) kills crabgrass but it also kills the grass and any other plants nearby where you spray it. It has no residual effect in the soil so your grass can eventually grow and cover the areas affected.
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