what are you doing to fight it? The disease is also stress related so cutting too low, over watering, too much shade, and too much Nitrogen. the area you live in is sandy soil and should drain well, st. augustine should not be cut lower than 2.00". do you have a shady yard?...if so, perhaps you could do some "selective" pruning to allow more sun.....shoot me some details and let's see if i can help....
that is confederate jasmine growing on the swing and yes....that is my hosta garden.
rog..