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(...) Following exposure for two growing seasons, 73,3% of provenance seedlings were dead, as were 64,8% from intraspecific crosses. Main stems of the remaining seedlings had died back, and the only leaves produced were on epicormic shoots. These results indicate that there may be no host genetic barriers to the continued expansion of the geographic range of the disease. Seedlings of the Chinese dogwood (Cornus kousa) exhibited leaf spot but no dieback
Frank S. Santamour (Sun,) studied this question.