- The disease is caused by the fungus Sclerotinia sclerotium.
- The disease has a wide host range including:
- oilseed rape
- Brassica vegetables
- The disease may be a problem where potatoes are grown in vegetable rotations.
- The disease survives in soil and plant debris as sclerotia which may be viable for up to 10 years.
- Infection of stems is associated with fall of infected petals and the disease is encouraged by moist conditions.
- The risk of disease infection may be reduced by wide rotations of all susceptible crops and improved drainage. More …
- There is evidence that Sclerotinia may be suppressed by application of fluazinam as 0.4 litre “Shirlan” / ha during a programme to control late blight (Phytophthora infestans).
- Suggested timings for fluazinam application are at rosette, flowering (to coat petals before they fall) and during senescence.
- There is a risk of blight resistance to fluazinam so additional fungicides should be applied for control of late blight.
See the manufacturers’ websites for details of agrochemical use.
Sclerotina stem rot notes
Sclerotinia control 2009 (Alternative hosts; potential for suppression with fluazinam)
Sclerotinia stem rot 2006 (Biology and disease development)