Dig up a small area of the "dead" grass, really deep to see if you have grub worms. They cause this type of dying off of grass. If so, check with your local extension service to see what they recommend locally for your problem.
Hi Ken: "I went to Home Depot and it was recommended I try:" That was good for a morning laugh.
I have known and had to deal with some of the sales people at the box stores and learned to not take their advice seriously. As long as you buy SOMETHING they really don't care if it works and product knowledge was not part of their job application.
Let us know what you find under that grass as suggested.
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