Celery - Late Blight

Key Points:

1. Septoria leaf spot or late blight is caused by the fungus Septoria apiicola

2. It is most pronounced during extended periods of leaf wetness such as:
   • cool misty nights
   • heavy dews
   • dull days
   • summer showers and autumn rains.
     
     
3. Control measures include:
   • Avoid use of excessive nitrogen
   • Use Healthy seed
     • heat treated seed with hot water  or;
     • fungicide seed treatment
       
   • Control disease in theseed bed
   • Remove volunteer plants
     
   • Use tolerant varieties (there are no resistant varieties)
     
   • Use a minimum of one year crop rotation

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