I have a three clump birch tree about five years old that has been healthy and growing. Just within the last two weeks, the leaves are turning yellow and dying on each of the three clumps. We trimmed the branches two weeks ago, but other than that don't know why the tree seems to be dying. Our neighbor has a birch 50 feet away and it appears to be doing fine.
If the yellow leaves are coming from the inside of the tree, it is likely responding to a change in soil moisture. Trees put on an abundance of growth in the spring when moisture is high and then find they can't support all that growth as the weather warms and the soil dries. They will shed excess leaves to conserve moisture. That may be what you're seeing, but it is best to make an appointment to have someone take a look.
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