Answer: Unfortunately, based on your description I am not able to tell you exactly what has happened. It might be related to the soil, a pest or a disease problem, or it might be that your lawn had a disproportionate amount of an annual grass variety in it and of course once that dies out it would not be expected to come back. Also, if your lawn is relatively new, it might not yet have been well enough established to endure a drought. And there are many other possible causes. It is very difficult to make this type of diagnosis long distance, and you need to know what happened prior to replanting so you can take steps as needed to avoid it happening again. I would suggest you work with your local county extension to troubleshoot the dead patches and work with them to develop a plan for replanting and maintenance. I'm sorry you have such trouble with your lawn.
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