Definition of downy mildew in English:

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downy mildew

noun

Mildew on a plant that is marked by a whitish down composed of spore-forming hyphae, penetrating more deeply into the plant than powdery mildew.
  • Family Peronosporaceae, subdivision Mastigomycotina.
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.

For editors and proofreaders

Syllabification: down·y mil·dew

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