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Downy mildew
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Downy mildew on cabbage
Downy mildew (Peronospora parasitica) on Brassica oleracea
Downy mildew (Pseudoperonospora cubensis) on cucumber. Severe defoliation of cucumber caused by infection from downy mildew. Fruits are not infected, but those that form are small and do not ripen properly.
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