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1. Oxford Dictionary

   downy mildew

   • n.
     mildew on a plant which is marked by a whitish down composed of spore-forming hyphae, penetrating more deeply into the plant than powdery mildew.

   • noun: downy mildew

2. • 更多解釋

   downy mildew

   • IPA[ˈdounē ˈmilˌdo͞o]

   • n.
     mildew on a plant which is marked by a whitish down composed of spore-forming hyphae, ...

   Oxford American Dictionary