We have a very small solid white bug very tiny legs you wouldn't know it was a bug unless you actually see it crawl. We have used neemon oil and used a fungicide soap . we don't know what else to do.
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This article will help you with white scale on crepe myrtle trees: https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/crepe-myrtle-bark-scale.htm