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Ceratocystis fagacearum Not Transmitted by Ambrosia Beetles. H. W. Wertz, Former Graduate Assistant, Department of Plant Pathology, The Pennsylvania State University, University Park 16802; J. M. Skelly(2), and W. Merrill(3). (2)(3)Former Research Assistant, and Associate Professor, respectively, Department of Plant Pathology, The Pennsylvania State University, University Park 16802. Phytopathology 61:1185-1187. Accepted for publication 5 May 1971. DOI: 10.1094/Phyto-61-1185.

Monarthrum fasciatum, Xyleborus saxeseni, and X. xylographus did not attack or transmit Ceratocystis fagacearum to healthy red oak seedlings, saplings, or mature trees. Xyloterinus politus attacked healthy red oaks of all ages and tunneled into the xylem, but transmission of the pathogen did not occur. Although high percentages of the insects acquired the fungus in vitro, few insects retained the fungus longer than 24 hr.