What’s wrong with my River Birch?

a few strands.

Can you photo from bottom up (the tree, not the leaves)

Aphids

I believe you are right. Thanks!

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What’s wrong with my River Birch? 30% of the leaves look like this

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Means you only have 70% left to kill, I hate those trees and their invasive root systems

My Crepe Myrtle had Aphids pretty bad. A coupled applications of Neem Oil did the trick, but not before turning my tree black with mold.

Which reminds me, the new branches are not growing as fast as my other non affected Crepe's....could it be stunted or something because of the mold?

I was told it was black mold caused by Aphids, but really have no idea. Tree turned solid black from base to tip, and every branch in between...along with every leaf.

Took me 6 hours with a power washer and a scrub brush to get it presentable.

They are dead from being River Birches. They don’t need a rhyme or reason. They just die.

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My Crepe Myrtle had Aphids pretty bad. A coupled applications of Neem Oil did the trick, but not before turning my tree black with mold. Which reminds me, the new branches are not growing as fast as my other non affected Crepe's....could it be stunted or something because of the mold?

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Could be aphids no doubt. The aphids and scale make honeydew which leads to the mold. My crepe myrtles were black, too, but once the old bark shed I've got nice, clean bark now.

I might've sprayed mine with malathion, or viper. Was planning to do a soil drench but the bugs cleared up prior to.