Flowering Disease Programme - Sclerotinia Control

Sclerotinia can be the most damaging disease of OSR grown in the UK. Control comes from protection of petals at flowering, before they fall so timing of sprays is crucial to achieve good control.

How to use:

  • Apply 0.46 L/ha Proline275 at early to mid-flowering.  Follow up with 0.32 L/ha three weeks later if flowering continues
  • If using a single spray approach apply 0.46 - 0.63 L/ha Proline275 at mid-flowering

A split spray approach has been shown to be the best, especially in high disease pressure situation or when flowering is prolonged.  In a split spray approach the first spray will have the biggest impact on final yields, Proline275 has been shown to perform better at this timing than competitors. Where a single application is used, if flowering is prolonged, the crop will not be fully protected against later infections of Sclerotinia.


Proline275 offers increased persistance over other products at this timing.  It's superior light leaf spot control can prevent pod infection when used at this timing.  In other crops prothioconazole is used for the control of powdery mildew which can be a problem in OSR at this time.  Prothioconazole has been shown to have activity against Alternaria when used to control Sclerotinia, there will be more effect from later applications.