Are numerous leaves dropping from your maple trees?
The culprit this time of year is probably the maple petiole borer.
There are several other reasons why leaves will fall from maples like squirrels, drought, and heavy aphid or scale infestations, however the characteristics of the maple petiole borer is obvious.
When petiole borers attack a leaf it looks generally healthy when it detaches from the tree.
The petiole or leaf stalk will have a limp spot in it and will dangle in the breeze. It will then fall from the tree.
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