Greater Diversity of Vegetative Compatibility Groups of Cryphonectria parasitica on Scarlet Oak than on Post Oak in North Carolina

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Abstract
The distribution of vegetative compatibility (v-c) groups of Cryphonectria parasitica on cankered post oak [Quercus stellata] and scarlet oak (Q. coccinea) was investigated in North Carolina. Of 37 separate cankers on 12 post oaks, 35 had one v-c group and two had two v-c group. The groups were the same or differed among cankers on single trees. On scarlet oak, seveal different v-c groups were present within small portions of infected butt sections. The number of different v-c groups within single scarlet oaks varied from one to five. Distribution patterns of v-c groups were not predictable, even among trees located close to each other.