Question
I live in Arizona at 4300' above sea level. Summer is hot (88-95 degrees) and humidity is less than 20%. The lawn is Fescue (not the fine kind), and watered every morning at sunlight. Patches turn brown at the tip (like it is burnt) and the stalk appears a darker green. Then the patch turns brown and straw-like. When I pull on the dead grass all I get is a handful of straw-like blades. The roots seem firmly set.  I've cleaned out one patch and found no grubs, but I don't know how far down into the dirt I have to go.  The brown patches are spreading even though days before the grass was green and healthy. Have I given you enough information to help you help me?

Answer
Hi Sandy;
I would say not enough watering, or not watering deep enough, or a fungus.
The roots being set doesn't sound like a fungus. the roots usually go and the grass you pull up feels slick or slimy.
You need to water to a depth of at least 6 inches, so when the top 2 or 3 inches are dry, there is still water down where the roots are.
It may just be too hot for fescue.
That is a cool season grass, and usually dies out in hot weather.
I live in the Dallas area, and except for this year, we are usually hurting for water here by this time of year.
I water to at least 6 inches and get a good, deep root system. A deep root system helps protect against heat and cold and drought damage, and prevents thatch.
I water only once a week until the temp gets past 100, then I water every 5 days.
If you have a very sandy soil, you may need to eater more often, but watering every day, just wetting the first inch or 2 od soil only teases the grass.
Do most of the lawns in your area have fescue?
I would check to see if that is a variety that does well in that area.
Charlotte