Try to encourage your good grass, you may need to overseed to get it to thicken up. Raise the height of you mower to the upper range that your grass can tolerate. That's 2 inches for species bermuda grass and 1 inch for cultivars (named varieties). Also, you can apply corn gluten meal over the lawn in spring to kill germinating crab grass. (too late for this year if yours is already up) This will also act as a nitrogen fertilizer. It's available from Gardens Alive Scroll down for more information.

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Terry

May the force be with you