In This Section | Canola
and Mustard: Sclerotinia Stem Rot |
| Author: | OMAFRA Staff |
|---|---|
| Creation Date: | 04 July 2005 |
| Last Reviewed: | 15 June 2009 |
| Publication
812: Field Crop Protection Guide > Chapter
6: Canola and Mustard > Sclerotinia Stem Rot (White Mould) |
Excerpt from Chapter 6, Field Crop Protection Guide, Order this publication
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.
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.
| Active ingredient | vinclozolin |
|---|---|
| Trade name | Ronilan EG |
| Rate per hectare (product) | 0.75-1.0 kg per ha |
| Rate per acre (product) | 300-400 g per ac |
| Active ingredient | vinclozolin |
|---|---|
| Trade name | Ronilan EG |
| Rate per hectare (product) | 0.5 kg per ha |
| Rate per acre (product) | 0.2 kg per ac |
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.
| Active ingredient | iprodione |
|---|---|
| Trade name | Rovral WP |
| Rate per hectare (product) | 1.0-1.5 kg per ha |
| Rate per acre (product) | 0.4-0.6 kg per ac |
Comments
Canola only. Ground and aerial application. Apply at 20%-30%
bloom. 12 hour re-entry period.
| Active ingredient | azoxystrobin |
|---|---|
| Trade name | Quadris |
| Rate per hectare (product) | 700-1,000 mL per ha |
| Rate per acre (product) | 283-405 mL per ac |
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.
| Active ingredient | boscalid |
|---|---|
| Trade name | Lance |
| Rate per hectare (product) | 350 g per ha |
| Rate per acre (product) | 142 g per ac |
Comments
Canola only. Ground and aerial application. 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.
| Active ingredient | prothioconazole |
|---|---|
| Trade name | Proline |
| Rate per hectare (product) | 315-368 mL per ha |
| Rate per acre (product) | 128-149 mL per ac |
Comments
Ground and aerial application. Apply when the crop is in the 20%-50% bloom stage.
Best protection will be achieved when applied prior to petals beginning to fall.
Higher rate is recommended for fields with a history of heavy disease pressure
or for dense plant stands. Good spray coverage is essential. The lowest label
rate of a non-ionic surfactant, AgSurf or Agral 90 may be tank-mixed. Maximum
1 application/yr. Do not apply within 36 days of harvest.
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