
Hi,
You've had me thinking on this one!! LOL So I did a search and found this....
""Question:
I have a Ficus benjamina in a well-lighted indoor location. There is very little leaf drop, but the tree has a great deal of sap running off the leaves onto the carpet. Can you tell me the cause and how to avoid it?
Answer:
The cause that comes to mind is an infestation by scale insects. Remember, I haven't seen your plant, so this is a guess based on the information you provided. While aphids can produce honeydew (the clear, syrupy, sap-like substance you are describing), Ficus are more likely to be infested with scale insects. These will appear as brown bumps on the twigs and leaves which can be scraped off with a fingernail.
Scale insects are difficult to control, especially if they have spread to other plants in your collection. However, there are pesticides which can be used to treat scale insects. You should be sure to select one which is made for use on houseplants in the house. Insecticidal oils and soaps may be your best option while the plants must be kept indoors. You will have to treat frequently, but you should at least be able to minimize the damage until the weather warms in the spring. Then you can take the plants out into a shady place for a few days while you treat with products which you can't use indoors.
If you don't find scale insects, take a sample of twigs with leaves to your local county Cooperative Extension Service office to diagnose your specific problem and recommend the appropriate treatment.""
HTH
Debs