White mold on the pot and roots of my avocado plants

in Plants

I really love the avocado I planted a few weeks ago. It looks healthy and grows fast. But today I looked underneath the pot and saw this white mold. Is it dangerous? What caused it?
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Enjoy your avocado plant ... are you going to prune it so that it branches out into a bushy plant?
info here (scroll down) https://www.thespruce.com/grow-avocados-indoors-1902590
for the fag ends of the aristocracy.
S.Yorkshire/Derbyshire border