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Elm leaf beetle stages and life cycle.Illustrations: Adult, first instar, second instar: L. O. Howard. 1895. The Shade-tree Insect Problem in the Eastern United States. Yearbook of the USDA. Washington, D.C. Egg cluster, prepupa: F. Silvestri. 1910. Contribuzioni alla conoscenza degli insetti dannosi e dei loro simbionti. Bollettino del Laboratario di Zoologia Generale e Agraria. Portici 4:246-289. Third instar: John Muir Institute. 1979. The Elm Leaf Beetle. Berkeley, CA. Pupa: G. W. Herrick. 1913. Control of Two Elm-Tree Pests. Cornell Univ. Agric. Exp. Sta. Bull. 333. |