I noticed these small white "balls" spreading rapidly on top of the soil of two adjacent plants.
When I repotted the plant, I noticed that the whole soil was full of it. Here's a good picture of some remaining balls sticking to the pot:
Since I didn't see any insects, I assume it's some kind of fungus or mold? Is it harmful to plants or humans? If yes, how can I get rid of it? Thanks for any leads!
