I think you have spider mites. But if you posted a pic would prob help. You posted way back in Dec and hope you found the solution back then. It's neem oil. I have a recipe that really works. Adjust the amounts to the size of the tree. I'd spray any plants you have immediately next to it.

1 pint very hot water
1 pint rubbing alcohol
1 tsp pure, cold-pressed neem oil
1/2 tsp MurphyâÂÂs Oil Soap
In a 1 qt spritzer, mix the neem with the soap & hot water. Shake
well. Add the alcohol & shake again. Shake regularly to keep the
mixture emulsified as you spritz the plant, making sure as you spritz
that you are covering all the vegetative surfaces, especially the
underside of leaves and leaf/branch crotches. Use all the mix same day
or discard. Use only pure, cold-pressed neem oil, such as that packaged
by Dyna-Gro. Other methods of oil extraction limit the effectiveness of
the active ingredient in neem oil

Good luck!