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Podosesia Syringae
The larvae feed on the ash and the lilac. They tunnel their passages straight into the wood for many inches. They cut their way out almost to the surface just before pupating, leaving only a thin layer of fiber to close the end of the gallery; this is broken through by the emergent pupa as it comes forth from its cocoon, and then the pupal envelope is split and the perfect winged insect appears. The moths are on the wing in western Pennsylvania in June, and are to be found on the blossoms of Syringa.