when...you subject your self vulnerable to the grumpy sarcastic cracks and giggles of the been-there-done-that'ers thats fine with me, i'll take the jokes with the wisdom. did i say take? i meant beg this isnt irrigation, but the irrigation guys know it, so this is irrigation! _____ I havent seen this st augustine problem-symptom before: The dead patches have a very dry crispy thatch, amongst pieces of healthy looking grass amongst. But if i take my hand and sweep/brush over the dry-thatch, there is a grid of very green and healthy looking stolons/runners&roots underneath. as if only the leaves were affected........ what is this?