Mouthparts are for chewing. This is an introduced species that feeds on elm tree varieties, especially the Siberian and European elms. Cedar elm, American elm and winged elm are less susceptible when other hosts are available. Larvae skeletonize foliage by removing the parts of the leaves between the leaf veins, leaving the upper leaf surface intact. Injured portions of leaves soon turn rusty, reddish-brown, and dry skeletonized leaves fall to the ground.
Adults eat roughly circular holes in leaves.
For additional information, contact your local Texas extension service agent, or search for other state extension service offices.