Answer: Sounds like the perfect description of the pear slug. It's the larvae of a sawfly and the critters are generally found on cherry and pear tree leaves. Because they appear late in the season, there's usually no control necessary. They will eat holes in the leaves, but the leaves will fall from the tree in about a month, so no permanent damage will be done to your tree. Rake the fallen leaves and remove them from the garden at the end of the season.
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