Spots dying in my lawn .
I have numourose of spots where my lawn is dying .it looks like a cottony like saw dust in the spots were my lawn is dead . What is this and how do I treat it .
St. Johns County Florida
Please post images for better assistance. But if you have a St. Augustinegrass lawn, my guess is sod webworm. Check out this publication for information: http://entnemdept.ufl.edu/creatures/ORN/TURF/Tropical_sod_webworm.htm.