These empty pupal skins are a sign of borer infestation. The borer is a white worm with a brown head and is one inch long at maturity. The adults have a blue body narrowly fringed with yellow, and have transparent wings with veins and margins fringed with steel-blue scales. Another sign of borer infestation is a mass of gum exuding from the peach tree branches. This gum contains bits of wood chips, sawdust, and frass produced by feeding borers.
Control is maintained by the use of insecticides.