VIEW ARTICLE

Resistance

Compartmentalization of Ceratocystis fagacearum in Turkey Oak in South Carolina. F. H. Tainter, Department of Forestry, Clemson University, Clemson, SC 29634-1003; S. W. Fraedrich, Department of Forestry, Clemson University, Clemson, SC 29634-1003. Phytopathology 76:698-701. Accepted for publication 6 February 1986. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/Phyto-76-698.

Nine turkey oak trees were inoculated on 30 April 1980 with Ceratocystis fagacearum. Although the trees partially wilted 4-6 wk later, when harvested on 16 August 1982, C. fagacearum was not recovered and the trees were still alive. A CODIT (compartmentalization of decay in trees) reaction was associated with infection. Tylosed vessels and densely stained vertical parenchyma cells formed noncoalescing visible discolorations mainly in 1980 xylem tissues. Increased tylose formation and discoloration, evident in crowns, stems, and roots the year of inoculation, subsequently decreased. Tyloses were present in fewer than 50% of the vessels, indicating a limited physiological effect of infection on this host. The CODIT reaction apparently plays an important role in South Carolina by limiting survival of C. fagacearum and enhancing the recovery of infected red oak hosts.