72 



Table 24. Showing Relative Hardiness of Different Tissue. 



Variety 



Tem- 

 pera- 

 ture 



Location 



of 



Tissue 



Results 



Ben Davis 

 apple tree 

 sections . . . 



Sept. 4,'12 



-5 



Sections from eight 

 year old Improved 

 Janet apple tree . . . 



Sept. 11/12 



Sections from five 

 year old Improved 

 Janet apple tree. . . 



Ben Davis apple, 

 seven years old, 

 2 in. in dia. at 

 crown 



Same, 2 in. in dia. . 



Sept. 12/12 



June 26,'U 

 June 26/13 



-5 



-5 



Sections taken at 

 intervals from 

 near the ground 

 to the twigs. . . . 



Sections taken at 

 intervals from 

 near the ground 

 to the twigs. 



Sections taken at 

 intervals from 

 near the ground 

 to the twigs 



Crown (highest 

 point where roots 

 attach 6 in. below 



surface) 



6 in. above crown 

 (surface of soil) 



Current sea- 

 son's twigs 

 entirely free 

 from injury. 

 In the older 

 wood injury 

 was slight 

 and confined 

 to cambium 

 and outside 

 part of sap 

 wood. The 

 lowest part of 

 trunk had 

 cambium 

 more severely 

 injured than 

 parts higher 

 up. 

 Injury most 

 severe in cam- 

 bium region. 

 Younger 

 stems less 

 browned than 

 older. Sap 

 wood injured 

 in 50% of 

 stems, great- 

 est injury on 

 most rapidly 

 thickening 

 side of stem. 

 Older wood 

 from near 

 ground decid- 

 edly more 

 brown than 

 younger wood 

 of twigs. Cor- 

 tex showed 

 first injury 

 and greatest, 'i 

 Cambium in- 

 jury slight. -S 

 Sap wood 

 injury con- 

 fined to older 

 wood. 



All sections 

 from lowest 

 to highest in- 

 jured in cam- 

 bium. All 



