Q.Crepe myrtles
I have a crepe myrtle that has yellow leaves, small branches are dying, there is a web like substance on several leaves, and the bark is falling off. My other 3 crepe myrtles are doing fine and flowering.

Downtoearthdigs
Answered on June 26, 2018
Sounds like Spider Mites. Neem Oil is a good treatment.
https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/crepe-myrtle-pest-control.htm
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