Answer: Drying and dropping of foliage (and occasionally branches) is a signal that the tree is defending itself against the drought. It is not necessarily a sign that the tree is dying. At this point in the season the leaves have done most of their job for the year and the tree can afford to lose some. Now it will be a matter of hoping there is sufficient rain to water the tree well this fall so that it goes into winter with adequate moisture. If not, you may need to try to water it, but this is very difficult with a large tree.
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