33 University of Vermont Extension EL 33 Maple Trumpet Skeletonizer by G.R. Nielsen, Former Extension Entomologist, Plant and Soil Science Department Folded maple leaves in August and September containing a long, tapering, blackish tube with adjacent undersurface leaf tissues skeletonized are the signs of the maple trumpet skeletonizer.
Sugar maple is the present preferred host in Vermont.
Red maple was preferred over sugar maple in the 1900 to 1910 period. It has been observed on red oak in Vermont. Occasionally, large numbers of moths gather on the bark. Larvae may be found on the foliage from late July into September. The larvae feed only on the parenchyma cells.