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Downy
Mildew is caused by the fungus Peronospora
manshurica. The disease is prevalent in late summer, but the damage level is
usually low. The fungus can be seedborne and seeds from infected plants may have
fungal colonies on their coats. This disease has not been considered a
major production problem and most varieties used are not resistant
to this disease. However, seeds infected with downy mildew can be mistaken for
white mold-infected seeds, and such a misidentification occurred many times
during the 1997 planting season. The pathogen also can survive in crop residues.
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