How to Care for Diseased Saw Palmetto Plants

Take a sample of the diseased area of the saw palmetto and have it analyzed, if possible. The cooperative extension service office in your area may be able to do this at low or no cost, or can direct you to the university in your state that performs the service.

Rake away all weeds and other undesirable vegetation from around the saw palmetto, and collect fallen leaves. Dispose of the collected plant matter away from the garden to avoid spreading infection.

Disinfect the blades of the pruning equipment. Cut away as much of the diseased area of the saw palmetto as possible. Dispose of it away from the garden.

Apply a fungicide. Anthracnose, caused by the fungus Colletotrichum gloeosporioides, was discovered infecting saw palmettos in Florida. Cercospora leaf spot fungus also may attack saw palmettos. Use a general purpose fungicide if the disease has not been diagnosed, and follow label directions for timing and application rates. Fungicides are generally more effective in preventing infection than in treating it.