Canola and Mustard: Sclerotinia Stem Rot
(White Mould) (Sclerotinia sclerotiorum)

Excerpt from Chapter 7, Field Crop Protection Guide, Order this publication

Table of Contents

1. Description
2. Integrated Pest Management Options
• vinclozolin – Ronilan EG (1 Application)
• vinclozolin – Ronilan EG (2 Applications)
• iprodione – Rovral WP
• azoxystrobin – Quadris
• boscalid – Lance
3. Related links...

Description

White mould is characterized by bleached stem lesions and hard black bodies (sclerotia) of white mould fungus inside the stems; it causes premature ripening of the plants.

Figure 1. White mould (Sclerotinia stem rot) causes white (bleached) stem lesions and hard black bodies in the stems.

Figure 2. White mould on seed. The black bodies of white mould are sometimes found in the seed at harvest.

Integrated Pest Management Options

This disease is often a problem when canola follows canola, white beans, soybeans or sunflowers. Use clean seed and a 4-5-year rotation with non-host crops such as corn, wheat, barley or oats. At present, no resistant varieties exist. Keep fields clean of broad-leaved weeds, since many are alternate hosts.

Comments
Canola only. For 2 applications, apply first at 20%-30% flowering and second 7 days later at late bloom (50%) if disease persists.

For single application at higher rates, apply at 20%-50% flower. Use the high rate where conditions are extremely favourable for disease development (heavy crop canopy, high humidity and/or excessive rainfall). Do not feed treated canola refuse to livestock. Use sufficient water to ensure thorough coverage of plant foliage. Tank-mixing with insecticide is not recommended, as this fungicide could affect insecticide efficacy. Do not apply with products containing boron. 40 days to harvest.

Comments
Canola only. Ground and aerial application. Apply at 20%-30% bloom. 12 hour re-entry period.

Comments
Canola only. Apply at early bloom (prior to 30% bloom). See label for information regarding resistant strains of fungus. Plant back-interval of 30 days for broadleaf and root crops and 45 days for cereals required. 30 days to harvest.

Comments
Canola only. Ground and aerial applications. Apply at 20%-50% flowering. Apply a second time 7-10 days later up to 50% flowering if disease persists or weather conditions are favourable for disease development. Tank-mixing with insecticide is not recommended as this fungicide could affect insecticide efficacy. 21 days to harvest.

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Related links...

• Agronomy Guide for Field Crops - Publication 811
  • Spring and Winter Canola: White Mould (Sclerotinia Stem Rot)
• Insects
• Canola and Mustard

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