I have been having the same problem year after year. In June, July and August my lawn looks terrible with these brown spots of dead grass and thinking it must be lawn moths larva that is probably eating the grass stems from under the lawn. I would love to hear how to get rid of them before they hatch. I have tried all kinds of commercial remedies and nothing seems to work and these brown dried grass spots seem to come to certain lawns as neighbours lawns look great. Any info on remedies to get rid of these pests would be a God send. Also I see white fully grown moths flying around and wonder if they are the cause of the problem. I have had this problem about 5 years ago and for that time no brown spots until this year. We are having rather hot weather this year . starting in the latter part of June and are there all summer.