242 Missouri Agr. Exp. Sta. Research Bulletin No. 8 



Table 35. Showing Relative Hardiness of Stock and Scion 



Roots. 



Date 

 Freezing 



Feb. 18,'13 



Feb. 18,'13 



Feb. 20,'13 



Feb. 20,'13 



Feb. 20,'13 



Mar. 3, '13 -15 



Mar. 3,'13 



Mar. 3,'13 

 Mar. 3,'13 



Mar. 3,'13 

 Mar. 3,'13 



Mar. 3,'13 



-11 

 -11 



-15 

 -15 



-15 



-15 



-15 

 -15 



-15 

 -15 



-15 



Material and Results 



Two-year old Ben Davis apple trees. 



6 inches. 



Scion root diameter i\ in. uninjured for first 



Cortex and cambium injury in remainder. 

 Similar root from stock dia. ui in-, uninjured for first 7 



inches. Cortex and cambium injury in remainder. 



A. Scion root, largest dia. ^g in., length 14 in. No injury 

 whatever. 



B. Scion root, coming from scion 2 inches below A. Largest 

 dia. J^ in; length 12 in. No injury in first 5 inches; last 

 7 inches were slightly browned. 



C. Scion root, 2 inches lower than B. Largest dia. i^e 

 in; length 12 in. No injury in first 6 inches; slight injury 

 in last 6 inches. 



D. Stock root, 1 inch below C. Largest dia. % in; length 

 10 in. Severe injury throughout. 



E. Stock root, 2 inches below D. Largest dia. J^ in; length 

 10 in. Very severely injured throughout. 



F. Stock root, 3^ inch below E. Largest dia. % in; length 

 12 inches. Severe injury throughout. 



G. and H. Arise at same point as F. Each 14 in. in dia. 

 at largest point; both 12 in. long. Severe injury in both. 



Main root. Largest dia. % in. No injury to scion part. 



Injury to cortex in stock part. 

 Fibrous roots under i^g in. dia. Injury on those from 



stock and not on those from scion. 



A. Scion root 4 inches below ground. Largest dia. J^ in; 

 length 10 in. No injury in first 5 inches. Remainder 

 very slightly browned. 



B. Stock root attached 2 inches below A. Largest dia. J^ 

 in; length 14 in. Injury throughout entire length. 



C. Stock root 2 inches below B. Largest dia. 3^ in; length 

 10. in . Injury in first 4 inches slight; remainder well 

 browned. 



D. Stock root same size as C. Attached at same portion 

 of main root. Injury somewhat more severe than C. 



Main root. Scion part, dia. % in., shows no browning. 

 Stock part, dia. 3^ in. is slightly browned. 



Two-year old Wealthy apple trees 



A. Scion root. Largest dia. 3/2 in; length 12 in. No injury 

 in first 7 inches; remainder slightly injured. 



B. Continuation of main root. Largest dia. 3-8 in; length 

 8 in. No injury in first 3 inches; last 5 inches slightly in- 

 jured. 



C. Stock root. Largest dia. 3^ in; length 12 in. Arises 



nearly opposite Root A. 

 mainder slightly injured. 

 A and B. 



No injury in first 6 inches; re- 

 No marked difference between 



