I don't think this is powdery mildew but all my google searches for "white spots on crepe myrtle bark" are coming up empty, so it's to the TexAgs I go.

There doesn't appear to be any bark "shedding," and this is not affecting the leaves and/or overall health, as far as I can tell, but what's this white stuff and do I use fungicide on it?

Looks like scale insects.

As it cools down Neem oil is what I had good luck with at the nursery. There are insecticides you can use too.

fightingfarmer09 said:

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Looks like scale insects.

As it cools down Neem oil is what I had good luck with at the nursery. There are insecticides you can use too.

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Winner! Scale, for sure.

Read this.. helped my crepes

https://agrilife.org/citybugstest/files/2010/05/EHT-049-Crape-myrtle-bark-scale.pdf

Aphids. 100%

Just sprayed one of mine. Little orange *******s everywhere. Killed them and the ladybugs swarmed to take out the rest.