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The effect of spirea aphid (Homoptera: aphididae) feeding and nitrogen fertilization on the growth of young apple trees, with comparisons to apple aphid /Kaakeh, Walid, January 1989 (has links)
Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1989. / Vita. Abstract. Includes bibliographical references (leaves 168-179). Also available via the Internet.
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