I am sorry for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
When a lawn has damage from a chemical application it is difficult to provide a quick fix. You can dig out and replace areas but that is a lot of work and expense. If the damage is not too severe it will outgrow it in time. So in the mean time you may just want to wait and watch and provide adequate care (mowing, watering and fertilizing). By later in the summer it should be recovering and looking better.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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