Received this Phalaenopsis "hotelensis" with a nasty looking black ring around what seems to be a flower spike. Any help identifying what it might be? I will be repotting this tomorrow and will see extend of damage but I don't see any spotting or yellowing leaves. Rest of the stem seems to be okay.
Would you treat with Physan 20 or Cinnamon spray (following First Ray's recipe) to contain the damage?