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Overwintering, migration and migratory morphs of Sitobion avenae (F.)Helden, Alvin Jonathan January 1993 (has links)
No description available.
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Investigations on the natural control of cereal aphids by predators and parasitoids in spring barley in Ethiopia and winter wheat in Germany /Mamo, Adisu Berhan. January 2003 (has links)
Thesis (doctoral) - Humboldt-Univ., Berlin, 2003. / Includes bibliographical references.
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