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11280. Anon.. 1992. Canola disease control requires rotation.. Growers Guide, June 1992, C12-13, Colfax, WA.
Disease management in canola requires cultural practices, since no fungicide is registered for use once the crop is planted. The two major diseases are blackleg and sclerotinia. Crop rotation helps reduce the carryover for these, with a minimum of four years between canola crops. Wild mustard is also a host for blackleg, which can spread easily by spores. Canola should not be planted closer than 0.6 mile from fields that had blackleg the previous three years. Certain varieties, such as Global, are moderately resistant to blackleg. The disease spreads by seed as well, and buying absolutely disease free seed is essential. Treating seed with Benlate can eliminate the disease. Sclerotinia stem rot, or white mold, can be a problem in wet weather. This fungus survives up to five or six years in soil, and becomes active during favorable wet weather conditions. A minimum four or five year rotation is recommended. Avoid planting susceptible crops during this time, including canola, mustard, sunflower, dry beans, soybeans, safflower, field peas, lentils, or garbanzo beans.