What's the plural form of powdery mildew? Here's the word you're looking for.
Answer
The noun powdery mildew can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be powdery mildew.
However, in more specific contexts, the plural form can also be powdery mildews e.g. in reference to various types of powdery mildews
or a collection of powdery mildews.
