St. Augustine Decline, Centipede Mosaic (virus - SAD): In early infection stages, leaves show a chlorotic (yellow) mottling. The mottling or mosaic symptom becomes progressively more severe until a chlorotic appearance is observed. In later stages of disease development, leaves and stolons begin to die and invading grasses and weeds crowd out weakened St. Augustine or Centipede grass. Infected grass does poorly in shaded areas.
Management: Plant a resistant variety - Floratam, Raleigh or Seville. Seville is very susceptible to downy mildew. Floratam is susceptible to cold injury and should not be used in more northern areas. Raleigh is adapted to the same areas as common St. Augustinegrass. No chemicals are available to treat diseases caused by viruses.