Killing of Plant Tissue by Low Temperature 



243 



In most cases those roots that came from scions were more hardy 

 than those of the same size coming from the stock, indicating that 

 the French seedling roots are less hardy than roots of a variety like 

 Ben Davis. This station has been unable to compare the hardiness 

 of scion roots from hardy varieties like Fameuse with those from 

 very tender varieties like Jonathan. 



A comparison similar to the foregoing was made with different 

 stock of plums and cherries using the Myrobolan and Marianna 

 varieties of plums and Mazzard and Mahaleb varieties of cherries. 

 The following table gives the results: 



Table 36. Showing Relative Hardiness of Mazzard and Ma- 

 haleb Cherry Stock and Marianna and 

 Myrobolan Plum Stock. 



Date of Freezing, January 25, 1913. 



