There may be several reasons for leaf drop, but one common problem is the maple petiole borer. It will burrow into the petiole in the spring, causing several leaves to fall off. The larvae remain in the leaf when it falls to the ground where it burrows into the ground and remains dormant until the following year. These insects rarely cause significant damage. However, if infestations are particularly heavy, treating the soil under the tree with a granular insecticide during the leaf fall can greatly decrease the damage the following year.
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