Diagnosing grey mould in narrow-leafed lupins

Grey mould (Botrytis cinerea) is a rare fungal disease that is favoured by warm humid spring conditions or dense crop canopies.


Large sunken lesions can girdle stems and branches and kill plants. Mature lesions have grey fuzzy mould

What to look for


  • Lesions on flowers and pods in humid spring conditions that cause them to abort.
  • Large sunken lesions that girdle and kill branches.
  • Mature lesions are characterised by grey fuzzy mould that may contain large black sclerotia.

What else could it be

Condition Similarities Differences
Diagnosing brown spot in narrow-leafed lupins Dark stem lesions Surface lesions without grey fuzzy mould
Diagnosing sclerotinia collar rot in narrow-leafed lupins Stem lesions, premature death. White cottony growth on stem instead of grey fuzzy growth.

Where did it come from?

Wet or humid conditions
Wet or humid conditions
  • The fungus is hosted by many broadfleaf plants, and survives on infected stubble.
  • Warm moist conditions favour infection, which ceases in dry spring weather.
  • Millions of spores are produced in grey mould that can be wind-borne over large distances

Management strategies

  • This disease may be more common in albus lupins but rarely causes economic damage in WA lupin crops.

Where to go for expert help

DDLS Seed Testing and Certification
+61 (0)8 9368 3721
Page last updated: Friday, 17 April 2015 - 9:09am