i took a sod sample to the extension office for testing. the result stated that: there was brown patch disease present, but they couldn't confirm that this was the cause of death. they also said they believe the nitrogen was excessive. i applied .80 lbs per k in april. i applied .80 lbs per k again in may. that was it. i would not consider that excessive. it's not neccesarily "light" but certainly not excessive. they also said the grass type was perenial rye. for the past 4 yrs i have reseeded this lawn each fall with a rye/fescue/bluegrass mix. what are your thoughts on this? have you ever had a bogus test result? the final outcome on cause of death, in thier opinion was, due to clay soil, this lawn will have the same reaction after long periods of heat. it will die, every year if we have a heat wave such as the one we are having the last 3-4 weeks. the bottom line is, the lawn "cooked".