Question
I have a young gingo tree and some type black fungus is developing on the
leaves. It's possibly some type of fungus. What can I do to same the tree?
What is the cause?

Thanks,

Dewey

Answer
Dewey:

If this black covering rubs off with a wet paper towel or wet finger, then it is sooty mold.  Sooty mold is a group of fungi that grows on the sugary excretement (poop) of insects. Sooty mold does not cause disease- an insect infestation is the underlying problem.

Google an image of sooty mold to see if this is what you have.  You can also attach a jpeg closeup of a few leaves and I will take a look.

Thanks for your inquiry!

Steve