ALWAYS check water 1st, put test cups out and check your coverage. Do the homework and the math on how much water your grass needs compared to how much you are giving it. Look at slopes and soil type AND your gutter to see if or when you start getting significant runoff. Maybe run irrigation in intervals.
Rainwater is an awesome supplement to irrigation. Very beneficial, no matter how great your lawn looks, it will look better after a good rain. You could write a small book on all the reasons why, but I am not going to.
2nd most important thing... pH of the lower 4" of the top 6" of soil. While doing this test (if you REALLY want a great lawn) also measure the length of your roots in each location. Test your good areas and you bad spots. Likely your good areas could get better if you acidify as well. BECAUSE:
You likely are trying to grow a 6.2 loving grass on 7.2 so your roots are very shallow and weak.
There is fungus, bugs and lots of other causes, but you have to go in order. If you are good on water and pH, everything else becomes small and easy to control.
ALSO, if your lawn care people are spot spraying for weeds, it is stressing the weedy areas. But hey, long as you keep throwing money to DuPont...
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