onion mildew
Definition
Noun A specific type of fungal disease, a downy mildew, that affects onion plants. It is caused by a fungus (Peronospora destructor) and is characterized by fuzzy, purplish-gray growth on leaves, which can lead to plant decay and crop loss.
Usage
The term "onion mildew" is used specifically in agricultural, botanical, and gardening contexts to identify and discuss this plant disease. * The farmer was concerned when he saw signs of onion mildew in his field. * Controlling humidity is key to preventing onion mildew. * Onion mildew can devastate an entire crop if not managed.
Advanced Usage
- The term is often used in technical literature and plant pathology guides. It is typically treated as a singular, uncountable noun when referring to the disease as a phenomenon.
- Example: "Onion mildew is a persistent problem in regions with cool, wet springs."
Variants and Related Words
- Downy mildew: The general category of plant diseases to which onion mildew belongs. "Onion mildew is a type of downy mildew."
- Peronospora destructor: The scientific name for the pathogenic fungus that causes onion mildew.
Synonyms
- Downy mildew (of onion): A more descriptive synonym that specifies the host plant.
- Onion downy mildew: A variant phrasing with the same meaning.
Related Phrases
- Fungus causing a downy mildew on onions: This is a descriptive definition of the term, not a common phrase, but it accurately explains the cause and effect.
Noun
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fungus causing a downy mildew on onions
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