To eliminate grubs as a possible culprit, dig up 1 square foot of turf in the dead area. If you find a dozen or MORE grubs, then grubs WERE the problem.
I don't have a great way to find and identify chinch bugs. If you want to get them, though, look for the Guardian brand of beneficial nematodes. They are available online.
Otherwise you have fungal problems. Apply ordinary corn meal at a rate of 20 pounds per 1,000 square feet. That's a good idea for now anyway. Do the entire lawn.
_________________ David Hall Moderator Dirt Doctor Lawns Forum
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