>>37162
>Rubbed in a laboratory to inoculate the disease in a healthy plant. I've seen it done with coffee rust. That is a step of determining that a species is the pathogen, if you spread it from a contaminated to a healthy host and it develops the disease you have part of the confirmation.
That's an experiment, not natural.
>No, they spread by known means such as air.
Whatever way they do spread or if they are dormant, fungi still aren't infectious. That's the point I'm making here.