Septoria nodurum blotch

Septoria nodurum blotch


  • Foliar disease more common in early sown crops and in wet springs
  • Initially airborne spores are released from stubble, and then spread by rain splash
  • Disease currently considered rare


  • Irregular yellow/black oval leaf spots which can expand to cause death in lesion centres 
  • Badly affected leaves will die back from the tips
  • Can infect the head when severe late in the season, causing black patches on glumes
  • Yield losses (20-30%) can occur in susceptible varieties
  • Reduction in grain quality can be significant


Resistant varieties, foliar fungicides, seed treatments, stubble removal, and crop rotation can all be effective in reducing disease incidence.

Links and Resources

DAFWA - Farmnote 456. Septoria nodurum blotch

Page contains information on cereal seed dressing and in-furrow fungicides used for septoria nodurum blotch, disease diagnosis, cautions, and further contacts. Page last updated 2011.

DAFWA - Rate response to fungicides for cereal leaf diseases

Summary, background, results, and discussion. Published 1998, last updated 2009.

DAFWA - Septoria nodurum blotch infection in wheat

Summary, risk factors, yield losses, disease management, fungicide application, and control. Published 2005.

Victorian winter crop summary 2014 - Septoria nodorum blotch

Table 6: Wheat disease guide. Page 11. Causal organism, symptoms, occurrence, inoculum source, and control. Updated annually.