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Development of biological control of twospotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae) on greenhouse ivy geranium, Pelargonium peltatum (L.) l'Her ex Ait., using the predatory mite, Phytoseiulus persimilis Athias-Henriot (Acari: Phytoseidae)

Opit, George Patrick.   Kansas State University ProQuest Dissertations Publishing,  2003. 3090378.