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UNIVERSITY OF CALIFORNIA EXPERIMENT STATION 



chambers which offered most favorable conditions for the growth of 

 fungi. Even where the wax was put on before there was much loos- 

 ening of the bark, it did little good because the later loosening and 

 curling of the bark cracked it (fig. 12). 



White lead, applied by painting the cracks soon after the freeze, 

 proved no more valuable than wax, and no places were found where 

 trees were in any way benefited by having the trunks wrapped in 



Fig. 13. Badly injured Eureka lemon tree, unpruned, five and one-half 

 months after freeze, showing the extent of damage and the new growth 

 that has developed. Trees at the stage shown in this illustration can be 

 pruned to advantage, all of the dead wood being removed at one time. 

 Photo June 24, 1913, by Tylor. (This tree was immediatley beside that 

 shown in fig. 14.) 



cow dung. Some cases have been reported, however, where gummosis 

 was started by this treatment. 



Pruning Injured Trees. One of the most important operations 

 necessitated by the freeze was pruning. It was maintained by some 

 that prompt pruning was very necessary in order to prevent a further 

 dying back of the frozen wood. This dying back would be caused, it 

 was claimed, by a backward passage of sour sap. However, difficulty 

 was experienced in telling soon after the freeze where the uninjured 

 portions of wood began. So when it was advised on the special Frost 



