Definition of downy mildew in English:

downy mildew

Line breaks: downy mil¦dew

noun

[mass noun]
  • 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.
    • Family Peronosporaceae, subdivision Mastigomycotina
    More example sentences
    • Both powdery mildew and downy mildew often infect squash plants as autumn nights grow cooler and dew keeps the foliage moist through the night.
    • Climatic conditions are conducive to the development of several major grape diseases, including: black rot, downy mildew and powdery mildew.
    • On cultivars highly susceptible to downy mildew and powdery mildew, some post harvest application may be required to protect foliage and prevent premature defoliation.

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