Definition

Noun 1. A specific plant disease-causing fungus: "Tobacco mildew" refers to a type of fungus that causes a downy mildew disease specifically on tobacco plants (Nicotiana tabacum). This pathogen is an obligate parasite, meaning it requires living tobacco tissue to grow and reproduce.

Usage and Examples

• As a subject: " is a serious threat to crops in humid regions."
• As an object: "Farmers must monitor their fields closely for signs of ."
• With a possessive: "The spread of can devastate a harvest."

Advanced Usage

• Scientific Context: In phytopathology (plant disease science), "" specifically refers to the pathogen . The disease it causes is known as "blue mold" or "downy mildew of tobacco."
  • Example: "The study focused on the lifecycle of Peronospora tabacina, commonly known as tobacco mildew."

Variants and Related Words

• Blue mold (n): A common name for the disease caused by tobacco mildew, referring to the characteristic bluish-gray fungal growth on the undersides of leaves.
• Downy mildew (n): The general category of plant diseases caused by fungi in the family Peronosporaceae, which includes tobacco mildew.
• Peronospora tabacina (n): The scientific (Latin) name for the tobacco mildew fungus.

Synonyms

• Pathogen (n): A general term for any organism that causes disease. (Tobacco mildew is a specific pathogen.)
• Fungal pathogen (n): A more specific term highlighting that the disease-causing agent is a fungus.

Important Notes

• "Tobacco mildew" is a compound noun that functions as a single, specific term in agriculture and botany. It is not typically broken down into separate meanings for "tobacco" and "mildew" in this context.
• It is distinct from other types of mildew (e.g., powdery mildew) that may affect different plants.

Noun

1. fungus causing a downy mildew on growing tobacco