Is this powdery mildew on tree leaves?
I'd appreciate some help diagnosing an issue, and would appreciate suggestions for dealing with it. I am in the hot and dry San Fernando Valley. I have a large shrubby tree, maybe a ficus? that has an infestation of......something. It has a grey webby/powdery substance all over the front and back of the leaves. I've been reading up on powdery mold, and it has some characteristics that seems like this is the issue, powdery and if I disturb the branches the white stuff flies off like a very fine dust, and makes me run for a dust mask before I breathe in the junk. However it also looks a lot like spider webbing on and between the leaves, which does not seem to be a characteristic of powdery mildew. There are no spiders or bugs visible. And it has not been humid here much this summer, just hot, and that appears to be a precondition for powdery mildew.
Any ideas? I'll try to add a photo in this post and/or in the link line.
Thanks so much.
Here is a link that might be useful: