We have a St Augustine lawn that has a extremely thick thatch layer. About three weeks ago the customer had us come in a rake out all the dead stolons and matted dead portions. We also lowered the mower to about an inch or so. Afterwards we filled in the bare spots with "filtered" topsoil and lightly spread topsoil across the areas that were not badly affected. Problems is that was three weeks ago and the turf has yet begin to spread. On top of that she now has leaf spot despite swearing she is watering at most twice a week. We can treat the fungus but was wondering if it could have come in on the topsoil? Also should we fertilize once we get rid of the fungus? Really stumped. Thanks for any suggestions.