This morning I was checking my orchids (I was away for a couple of days) and I found yellow mold on one of my phalaenopsis. There was only a little pit of it. I watered my orchids including the one with the mold. For this evening there was much more of it and it is on the roots.
After I finish writing this I will go and repot the orchid. What can I do to fight this mold. Is there anything I can use to treat the plant with?