Answer: Unfortunately, based on your description I am not able to tell you what is happening to your lawn grass. It might be due to lack of watering or improper watering, a disease, insect infestation such as grubs, or possibly overfertilization or accidental chemical exposure. I would strongly suggest you consult with the lawn care company as well as with your local Penn State cooperative extension staff. The lawn care company should have records of what was applied to the lawn, and the extension staff should be able to help you troubleshoot and once you have a firm diagnosis, they can help you determine how to proceed. I'm sorry I can't be more specific for you.
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