Killing of Plant Tissue by Low Temperature 



209 



Eustace^ often observed the greatest injury to peach trees to 

 be just above the snow line. Following the winter of 1904 Green 

 and Ballou^ reported that an Ohio fruit grower was able to save his 

 trees by banking the bodies with manure, thus keeping the tempera- 

 ture of the trunks near the ground from going as low as that to which 

 the remainder of the tree was exposed. 



To test this point at the Missouri Experiment Station, sections 

 of tissue from young and old trees were taken at different points 

 along the trunk beginning near the ground and continuing upward 

 into the branches. These were collected and frozen at intervals 

 throughout the year beginning in September and ending the follow- 

 ing July. The results are shown in the following tables: 



New York (Geneva) Agr. Exp. Sta. Bui. 269, 1905. (BIbl. No. 38). 

 'Ohio Agr. Exp. Sta. Bui. 157, 1894. (Bibl. No. 48). 



