Killing of Plant Tissue by Low Temperature 



293 



It should be said that the varieties of the Hills Chili group 

 are usually less vigorous growing trees, and since these seedlings were 

 very closely planted, trees of the Hills Chili group would suffer more 

 from shade in summer and thus have a larger percentage of buds 

 not fully developed that are killed during even a mild winter. It will 

 be seen that as a general thing those varieties which are most hardy 

 have given seedlings that are also most hardy. By referring to this 

 table and to Table 39 it will be seen also that these seedlings were 

 generally not more hardy than the parents, though of course in the 

 case of Elberta a cross between the rather hardy Chinese Cling 

 and Crawford's Early, and tender like Crawford 's Early some of 

 the seedlings would tend to be more hardy than Elberta. 



KILLING OF APPLES 



Killing of the Roots. Killing of roots was not discussed for 

 peaches because so far as can be learned, the killing of peach roots 

 does not vary greatly from the killing of apple or of other fruit-tree 

 roots. The killing of apple roots is probably a more common phe- 

 nomenon than the killing of peach roots because peach roots are not 

 so much more tender than apple roots as peach wood or peach fruit 

 buds are more tender than apple wood or api^K- fruit buds. On ac- 

 count of the greater tenderness of wood and fruii buds, the peach tree 



