Northern Nut Growers Association, Report Of The Proceedings At The Tenth Annual Meeting. / Battle Creek, Michigan, December 9 and 10, 1919

by Unknown

Summary of Evidences of Resistance

We may summarize the evidences of resistance as follows:

1. The results of the inoculation tests show that the fungus grows in these trees on the average from ¼ to ⅓ as fast as in ordinary chestnut.

2. The occurrence of the trees in a neighborhood long subjected to the disease, and their presence among the trees of individuals long since dead.

3. Indications of the long period the disease has been present in the trees themselves; such as bare weathered tops, and healed cankers.

4. Peculiarities of the bark; such as extensive development of the callus tissue, and the presence of a peculiar substance or white secretion which is particularly conspicuous in cases of marked resistance.