In 2015, I reported that I had found sawfly larvae skeletonizing American bladdernut (Staphylea trifolia) leaves in southwest Ohio (see BYGL Bug Bytes, September 3, 2015, “Scarlet Oak Sawfly on Bladdernut?”). The title of that report was based on the appearance of the larvae: they were the spitting image of Scarlet Oak Sawfly (Caliroa quercuscoccineae) which is sometimes called the scarlet oak slug sawfly or just oak slug sawfly. The “slug” in the common names are based on their elongated unsegmented bodies and a covering of mucoid-like slime that presumably helps them stick to the undersides of leaves.
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