In This Section |
Canola and Mustard: Blackleg (Leptosphaeria maculans)
Excerpt from Chapter 7, Field Crop Protection Guide, Order this publication Table of Contents
DescriptionThe first symptoms appear on the cotyledons or leaves as round-to-irregular (1-2 cm) white-to-buff lesions that contain numerous small black dots (pycnidia).
Figure 1. Blackleg causes round-to-irregular, white-to-buff lesions containing many black dots (pycnidia).As the season progresses, the fungus may spread to the stem and crown of the plant, producing a canker that can girdle the stem. |
| Active ingredient | carbathiin + thiram |
|---|---|
| Trade name | Vitavax RS Fungicide |
| Rate (product) | 833 mL per 100 kg seed |
Comments
Do not graze or feed livestock on seeded area for 4 weeks after
planting.
| Active ingredient | imidacloprid + carbaithiin + thiram |
|---|---|
| Trade name | Gaucho CS FL |
| Rate (product) | 1.4 L per 100 kg seed |
Comments
Not for use in hopper-box, planter-box, slurry-box, or other non-commercial
seed treatment application. Do not graze livestock on treated areas
for 4 weeks after planting. Mustard greens having Gaucho CS seed treatment
must not be used for human consumption. Follow resistance management
recommendations as stated on label.
A foliar fungicide may be warranted if blackleg symptoms occur at the seedling and rosette stages or if a susceptible variety is being grown.
| Active ingredient | propiconazole |
|---|---|
| Trade name | Tilt 250 E |
| Rate per hectare (product) | 500 mL per ha |
| Rate per acre (product) | 200 mL per ac |
Comments
Canola only. Ground and aerial application. Apply at rosette stage.
Do not feed treated canola refuse to livestock. 60 days to harvest.
| Active ingredient | propiconazole |
|---|---|
| Trade name | Bumper 418 EC |
| Rate per hectare (product) | 300 mL per ha |
| Rate per acre (product) | 121 mL per ac |
Comments
Canola only. Apply during the rosette stage, between 2nd true
leaf and bolting. 60 days to harvest.
| Active ingredient | azoxystrobin |
|---|---|
| Trade name | Quadris |
| Rate per hectare (product) | 500 mL per ha |
| Rate per acre (product) | 200 mL per ac |
Comments
Canola only. Apply at 2-6-leaf stage. 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.
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