Diseases of field crops in Diseases of field crops in the Prairie Provinces disoffieldcrop Year: 1957 SUNFLOWERS Figure 25.—Sclerotinia wilt of sunflowers. in the soil. In moist, cool seasons, the sclerotia may produce small fruiting bodies which liberate spores into the air. The spores produced in this way are important in starting infections in some areas, but seem to be quite unimportant under Manitoba conditions, where the spread of the fungus seems usually to be limited to the distance that the mycelium can extend through the soil. 79

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