FUNGOUS AND PHYSIOLOGICAL DISEASES. 439 



Treatment. This consists for 

 the most part in removing con- 

 ditions and discontinuing prac- 

 tices which induce the disease. 

 Make a thorough study of the 

 soil and the methods of fertiliz- 

 ing. In some places, with trees 

 growing on hard-pan, the follow- 

 ing plan was adopted and they 

 made a complete recovery: The 

 trees were cut back, lifted from 

 the ground, the hard-pan re- 

 moved, either by blasting or pick- 

 ing it out, and the trees re-set. 

 The remedy for trees growing in 

 damp ground consists in paying 

 proper attention to drainage and 

 fertilizing. Tile or box drains 

 should be put in to remove the 

 water and allow the air to enter. 

 Where the disease has been brought about by the use of 

 fertilizers, as before indicated, discontinue their use, dis- 

 continue cultivation, allow the natural vegetation to spring 

 up and apply potash and phosphoric acid as usual. Con- 

 tinue this treatment until recovery takes place; then re- 

 sume cultivation and fertilization, using nitrate of soda 

 or sulphate of ammonia as a source of nitrogen. 



Solution No. (1) has in many cases given excellent 

 results, but sometimes no results have been obtained. 

 It is doubtful whether the injurious effects of a hard- 

 pan sub-soil can be overcome by spraying. But in other 

 instances it may prove beneficial. Because Bordeaux 

 mixture is a fungicide and has given results in cases of 



