White 'cotton' fungus on a columnea?
One of my Columnea has just dropped nearly all of its leaves while flowering and looks in real trouble. I decided to cut it back and noticed that there is a white cotton like fungus(?) at the base of each flower.
I need to identify this in order to look for a treatment. The only possible thing I could come up with in my reference book on plant diseases was sclerotium stem rot, however I am not fully convinced. Does this sound reasonable?
Can anyone suggest an alternative identification of a treatment?