Bipolaris - Disease on Warm Season Lawns

Every summer we get questions about Bipolaris. Here are bullet points for diagnosis and action on this disease.


  • Look on your grass leaf blades for purplish brown to black spots with tan centers (see examples below).
  • These are the conditions that trigger bipolaris disease:
    • 10 hours per day with water/moisture on the leaves;
    • But . . . bipolaris becomes more severe when the ground dries out;
    • High Nitrogen fertilization coupled with low Potassium levels;
    • We especially see this disease after a lot of Nitrogen is applied, then the lawn is scalped.
  • All Bermuda, Zoysia, and Centipede lawns are prone to this disease under the described conditions.


  • Application of high Potassium fertilizer as soon as symptoms appear. We recommend at least 3 times more Potassium (K) than Nitrogen (N) and have 5-10-30 (N-P-K) in stock.
  • Fungicides are also available.
  • We carry both the appropriate fertilizer and fungicide in our stores. 


Bipolaris id close up.jpg

Bipolaris Identification: Look for purplish brown to black spots with tan centers. 



Scalping when mowing is a Bipolaris Trigger Condition.

Find your nearest Super-Sod and come by as soon as possible for Bipolaris treatment options. 

Look up Your Local Super-Sod Store