Problem: St. Augustinegrass decline
Little is know about the spead of SAD in the wild except that it is caused by panicum mosaic virus. Like many viruses, it could be carried by insects that ingest infected sap and transmit SAD to other grass during feeding. In lawns, infected grass clippings readily spread the virus to healthy turf.
No cure is available for viral lawn diseases. Remove infected grasses along with the first few inches of topsoil. Apply fresh soil and replant with grasses known to have some resistance to SAD. Avoid cutting a healthy lawn with a mower that has recently trimmed an infected one. Do not mow wet turf.