Although a number of diseases have been identified for sunflowers, just as with other crops, relatively few diseases have been seen in Missouri. In cool wet soils, seeds or seedlings may be attached by fungi, so seeds are typically treated with fungicide. Various leaf and foliar diseases will cause surface spots or yellow patches, but do not impact yield. Probably the greatest disease threat to sunflower is sclerotinia (white mold), which is also found in soybeans, canola, and certain other broadleaf plants. Using good rotation practices, including not planting sunflower in a field more than every three to four years, can reduce likelihood of disease.
*Pesticide products are mentioned in this guide only as a starting reference point for product use, and are not a guarantee that a label for the product is applicable to Missouri. For latest information on use of a pesticide, consult the product label or a company representative.
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