In late spring, many leaves fall suddenly from maple trees. The end of the leaf stem is dark and shrunken, and broken off at the shrunken spot. About a week later, portions of the remaining leaf stems fall to the ground. If the stem portions are split before they drop, a soft white insect will be found inside.
The borers do little damage, so it is best to ignore the problem. Most years, the damage is not noticeable.
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