That sounds exactly like what we got a few months after planting our grass last year. We had a little bit of white powder on the blades in the mornings as well. I beleive it was Pythium Blight but never 100% identified it. I think we watered too frequently for too long after we planted. We also went through a pretty long hot spell which combined with the over watering may have caused it. Anyway, I cut way down on the watering (actually stopped watering for the rest of the season since it was getting into autumn) and it seemed to clear it up.
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