Lilac Borer (also known as ash borer)
Podosesia syringae

• Wilted or dead stems
• Base of stem swollen with ¼ inch exit holes
• Sap, sawdust and frass exuding from holes
• Reddish-brown pupa cases sometimes found protruding from exit holes
• Larvae are 1' long; creamy white with light brown head
• Adult is a clear wing moth that resembles paper wasp; smoky brown forewing, hindwing is clear with brown edge.
• More information on Lilac borer...