Abstract
Seedlings of 13 Chinese chestnut cultivars were inoculated with and evaluated for resistance to Cryphonectria parasitica. Canker widths differed among the cultivars. Cankers increased for 1 week after inoculation but gradually constricted through callus formation; cankers on American chestnut controls expanded at a rate of 0.6 ± 0.3 mm per day until stems were girdled. Isolates of C. parasitica caused differential responses in Chinese and American chestnut.
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