Abstract
Adult female specimens of Parthenolecanium corni (Bouche) and Parthenolecanium quercifex (Fitch) are often times confused for one another and misidentified. Members of the Parthenolecanium do show host-induced morphological dimorphisms, and the adult female is heavily sclerotized which can make key morphological characters obscure. Utilization of morphological characters of the first instar can help in the accuracy of the identification process. Key characters in distinguishing P. corni from P. quercifex are the absence of large (>5 μm) in the dorsal pore pattern.
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