You've got WHITE FLY for sure. Look under the leaves as well. Instead of spraying NEEM solution, what I do is make a big 3 or 5 gallon pail of water mixed with 1 oz NEEM per gallon. Take a paper plate and slice the paper plate to the center. Place the paper plate over the potting soil with the stem at the center, turn upside down and swish the plant in the NEEM solution. Throw a little of the solution on the top of the soil. Where is this plant living? You might have to do a little bit of housecleaning in the area to kill all the white fly. Looks like you have spider mite as well. This will treat both! Where this plant lives there will be all kinds of white fly stages and spider mite that will reinfect your plant. Clean and expect to do additional dunkings. Check your plants in a week or two at the most and if you see any sign, dunk again...new solution of water and NEEM. Wipe surfaces around your plants environment with bleach. This should work for any fungus as well. White Fly and spider mite cause optimal conditions for fungus with their excrement + bacteria = honey dew, loved by fungus. Fungus will go bye bye when you take care of the insects.