There isn't one single scientific name for mildew. "Mildew" is a general term for a variety of fungal diseases that affect plants, often causing a powdery or fuzzy coating.

Here's why:

* Different Types: There are two main types of mildew: powdery mildew and downy mildew. They are caused by different fungal species.

* Specific Species: Within each type, there are numerous species of fungi that cause mildew. For example, *Erysiphe necator* is the powdery mildew that affects grapes, while *Plasmopara viticola* is the downy mildew that affects the same plant.

So, to be specific, you need to identify the type of mildew and then the specific fungal species causing it.

Here's an example:

* Powdery mildew on roses: *Sphaerotheca pannosa*

* Downy mildew on tomatoes: *Phytophthora infestans*

If you're unsure about the specific type of mildew, it's best to consult a gardening expert or plant pathologist for accurate identification.