Killing of Plant Tissue by Low Temperature 



225 



Eustace observed that the trees may be badly injured and yet enough 

 fruit buds left for a full crop of fruit. This last, however, was the 

 condition when the tissue of the tree had not reached the proper 

 maturity before the cold period came. The fruit buds seem, some- 

 times at least, to reach about their maximum condition of maturity 

 more quickly than wood tissues, especially that near the base of the 

 tree. Tables 23 and 24 give some information as to the relative 

 hardiness of other tissues, and the following table gives the result 

 of some additional freezings where buds were frozen in comparison 

 with other tissues: 



Table 29. Showing Relative Hardiness of Different Tissue, 

 Including Buds, at Different Seasons of the Year. 



Variety 



Elberta peach twigs.. . July 15, '13 -6 



Elberta peach twigs.. . 



EJberta peach twigs, 

 buds and sections of 

 wood 



Champion peach twigs 



10 in. long July 29,'12> -5 



July 16,'13 



July 28,'13 



Belle of Georgia peach 

 tree, five years old; 

 sections of trunk 

 and limbs 



Aug. 29,'12 



Elberta peach tree, 



buds and twigs and 



sections of trunk 



and limbs ^ept. 14, '12 



Elberta peach twigs [ j 



(one year oldj Oct. 5, '12 



-5 



-5 



-5 

 -5 



Elberta peach twigs.. . Nov. l.'ll, -9 



I 1 

 Elberta peach twigs.. . Dec. 7, '12 -16 



Results 



23 buds, 78.3% killed. 10 twigs 7 

 injured in cambium. 3 in cam- 

 bium and cortex. 



50 buds, 100% killed. 20 twigs, 

 all injured in cambium and cortex. 



37 buds, 100% killed. Roots, dead 

 in cambium and cortex. Wood 

 just above ground, severely in- 

 jured in cortex and cambium. 4 

 feet from ground, same as above. 

 This years' growth, same as above. 

 Sap wood and pith of youngest 

 portions dead. 



95% of leaf surface dead. Cortex 

 injured 6 in. back of terminal. 

 Cambium, pith and sap wood in- 

 jured to 8 in. back of terminal. 



Buds, 100% killed. Young sap 

 wood and cambium killed in all 

 sections. Least injury to bark 

 was in three year old wood. Bark, 

 cambium and sap wood killed in 

 twigs. 



Buds 100% injured. Bark cam- 

 bium and outer portion of sap 

 wood injured in all cases. 



Buds 90. 91% dead. Cambium and 

 cortex injured cxccjit at ba.-^e of 

 one twig. Sap wood injured only 

 in terminal part tuig. 



104 buds; 63' t dead. .>:.^ twigs; 

 60.6% killed in cambium, other 

 tissue not injured. 



Injury confine<l to shoulder bilow 

 bud and |>ith rigion. Buds prop- 

 er, uninjured. 



