Answer: Check the fallen leaves carefully for spots or signs of insects. If you find none, the problem indicates some stress. Heat stress is most common, followed by water stress. Although you have two and only one is showing signs of stress, that particular crepe myrtle just isn't getting the water it needs or is more sensitive to the heat. It may outgrow the heat stress, but it should be consistently getting the water it needs or it will eventually decline. You might try giving it a little more water to see if that improves things. I hope so!
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