What makes healthy leaves fall off for no reason.

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The tree is a weeping birch. The leaves look healthy. There a hundreds a day. No sign of bugs or dicoloring.
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How old is the tree?  If indeed it was planted in the 60's than it could be on its last legs, to check this drill a small hole, 1/4" about a foot from the base of the tree and no more than 4" deep, if the same comes out immediately, then its due to stress, if it takes more than 8 hours to see sap, the tree is dying, if you see no sap at all, the tree is dead, with only a few parts trying to survive,  at this stage you might consider replacing the tree itself.

-Birdy
by Master Gardner (33.2k points)

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