How to Avoid Fungus

Large Patch

DIAGNOSE
When nighttime temperatures drop below 68 degrees and daytime temps stay in the mid-80s this disease often appears in lawns.

PREVENT
Avoid applying too much nitrogen fertilizer and overwatering.
TREAT
Apply a proper fungicide.

Take all Root Rot

DIAGNOSE
This St. Augustine lawn has yellowing of the grass and tiny puzzle piece-shaped fungal structures.

PREVENT
Reduce water applications and apply sphagnum peat moss or ammonium sulfate fertilizer to reduce soil pH.
TREAT
Apply fungicide at the first sign of the problem.

Gray Leaf Spot

DIAGNOSE
St. Augustine grass is affected in late summer as the result of high humidity. Leaf spots are grayish in color with purple margins.

PREVENT
Grass infected with this fungus should not be given nitrogen fertilizers until the disease is cured.
TREAT
Apply a proper fungicide.

For a listing of some of the common lawn and plant diseases in BCS click here.

Images courtesy of Young-Ki Jo, Ph.D.