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UNIVERSITY OF CALIFORNIA EXPERIMENT STATION 



much more readily than the parts of the trees that had attained their 

 size more slowly. This is probably the explanation of some of the 

 freakishness noticed in trees where one branch of the tree was killed 

 and the rest of the tree remained undamaged. 



A case illustrating this point may be cited, where a navel orange 

 tree showed no signs of injury except on one branch, and this branch 

 was killed. On careful inquiry, it was found that a year or two before 



Fig. 6. Valencia orange tree in foreground on which the young rapidly 

 growing branches were all killed. The mature foliage on the older trees 

 in the background was but slightly injured. The fruit on trees showing 

 such injury is certain to be a total loss. Photo by Smith, January 24, 1913. 



a branch on this side of the tree, which was particularly heavy with 

 fruit, was twisted and broken during a strong wind, so that it had to 

 be cut out, leaving a large hole in the side of the tree. A new sprout 

 grew out near the base of the cut branch, and it was this rapidly- 

 grown branch that was frozen. 



Effect on Bark. After the freeze, many of the trees showed a 

 splitting and loosening of the bark. This was especially common on 

 lemon trees, but occurred also on orange and grapefruit trees, where 

 the temperature went sufficiently low. Sometimes the bark split even 

 when the foliage was not damaged, and cases were reported where the 



