applestar wrote:Closely related to what jal_ut said, but this may not be mold as in moldy fruits and bread, but mycelium from mycorrhiza intentionally added to premium potting mix, especially if you recently transplanted. A colony of mushroom mycelia look white and furry too.
But, but, I never used any mix that mycorrhizae has been added to and often did get white fuzzy mold on the top of the mix.
Mycorhizeae ( I'll get the spelling coorect without looking it up one of these times) parasitize the roots and don't form arial mycelia.
Heaven knows there are enough fungi in the air everywhere that have white mycelia and spores that can mess up the surface of our seedlings.
As well I know that from the Mycology courses I took in college where alians would show up just taking the lid off the petri dishes that had been innoculated with the desired fungi as well as the mycology courses I taught to Med students all those years where they too grew known fungi.
Oh, am I happy that I'm retired.