Diseases of lettuce crops

This guide covers fungal and Oomycete disease of lettuce.  

The extent of losses caused by these diseases to lettuce crops varies considerably according to the disease type, method of crop production, lettuce variety, season and other factors. Many lettuce diseases can cause considerable damage and occasionally complete crop loss.

The guide will cover the following: 

  • Downy mildew
  • Fusarium wilt
  • Grey mould 
  • Phoma leaf spot and basal rot
  • Powdery mildew
  • Pythium diseases
  • Rhizoctonia bottom rot
  • Ring spot
  • Sclerotinia
  • Minor diseases