i have seen that on the fantastic forum, that someone had a similar sounding issue with a plam. I have a sticky deposit, some small black dots and a white "fiberous web" like structure, at the nodes where the joint of the fronds where they join the trunck. are these related to a parisite or scale rather than a fungus? any help appreciated (thanks in advance)
My guess is you have a combination of pests: The sticky substance (honeydew) from scale and the webbing from spider mites.
Yes, a soapy spray will work. I use insecticidal soap. Horticultural oil is another alternative. These two products and their usage have been discussed before in these forums; use the forum's search function to retrieve them. Good luck.