Diagnosing sclerotinia collar rot in narrow-leafed lupins
Sclerotinia collar rot is caused by the fungus Sclerotinia minor and should not be confused with Sclerotinia sclerotiorum , which causes a stem rot higher up the plant.
What to look for
- Isolated plants or small groups that wilt and prematurely die in spring.
- Lush, wet crops are most affected.
- White fungal growth is evident on the stem just above ground level of infected plants.
- The fungal growth contains small black fruiting bodies, about the size of a pinhead called sclerotia.
What else could it be
|Diagnosing spring drought in narrow-leafed lupins||Premature death.||No white cottony growth.|
|Diagnosing salinity in narrow-leafed lupins||Premature death.||No white cottony growth.|
|Diagnosing charcoal rot in narrow-leafed lupins||Premature death.||No white cottony growth.; ash grey root interior|
|Diagnosing grey mould in narrow-leafed lupins||Stem lesions, premature death.||Grey fuzzy growth.on stem instead of white cottony growth.|
Where did it come from?
- The fungus survives between seasons as sclerotia in trash and soil. The sclerotia germinate under suitable environmental conditions and infect plants as fungus grows out from the sclerotia.
- Sclerotinia minor can infect many broad leaf crops, pastures and weeds and is most common in rotations containing broad leaf species in close succession (for example, lupin following canola).
- Sclerotinia collar rot rarely causes large yield reductions.
- Cereals do not host the fungus and will help reduce inoculum levels.
Where to go for expert help
Page last updated: Friday, 17 April 2015 - 2:30pm