I am trying to diagnose a possible SAD infection of my new Palmetto St. Augustine grass. Even though Palmetto is advertised as a superior St. Augustine, it appears to easily catch diseases.
These are images of “sick” parts of my grass. I am not sure if I have SAD or downy mildew or something else. While some pieces of grass show SAD-like symptoms, most show strong symptoms of downy mildew or fungus.
You can barely make it out, but this blade has parallel stripes running down its length.
Another blade with stripes and burn marks.
Stripes and burn marks readily apparent.
The lighter-colored areas are where the grass is discolored. The grass on the left half is the “new” grass from Sept. 2006. The grass on the right is old grass. The grass in the foreground is some native (?) bermuda that grew over a spot where I filled in some dirt.
More representative grass sections.
Here’s a piece showing SAD-like symptoms and burn marks.
Another view with other striped grass blades shown more prominently.