Thanks to the University of Maryland/Maryland Grows this informative article about crapemyrtle woes.
Q: My crapemyrtle has white stuff on the bark that I’ve never noticed before, though the foliage looks unaffected, if a bit dull lately. I thought these plants were pretty pest-free, so what might this be?
A: We’ve had a lot of inquiries about this lately. Your plant has Crapemyrtle Bark Scale(CMBS), a non-native insect pest that was discovered in Texas in 2004. It was confirmed in Maryland in 2020. Incidentally, crapemyrtles also can host Crapemyrtle Aphid. And, it’s possible for the two to be infesting a plant simultaneously; their impacts on the plant are similar.
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