Related Program: NatureNotes Caterpillars? By Rudy Mancke • Jul 13, 2018 Related Program: NatureNotes TweetShareGoogle+Email The larvae of the Dusky Birch Sawfly are often mistaken for caterpillars. Lacy L. Hyche, Auburn University, Bugwood.org The Dusky Birch Sawfly is a stingless wasp. As the common name implies, its prefered food plant is the River Birch. Listen Listening... / 1:00 NatureNotes is a production of South Carolina Public Radio. Tags: NatureNatureNotesInsectsSCETV Appscetv.orgTweetShareGoogle+EmailView the discussion thread.