CHAPTER IV 



TREATMENT OF FCJNGX7S ATTACKS 



Methods of dealing with fungus attacks fall mainly 

 into three groups according to the end they have 

 in view. Either they aim at 



(a) The protection of the plant against attack ; or 



(6) Rendering conditions unsuitable f orthe growth 

 and spread of the fungus ; or 



(c) The removal of the source of infection. 



We have already dealt with the principal safe- 

 guard against disease in our first chapter, and need 

 only briefly mention the necessity for the mainten- 

 ance of proper cultural conditions and of adequate 

 and properly balanced supplies of earth-salts, water, 

 air, Hght, and heat. We may put the remaining 

 methods in numbered paragraphs to facilitate re- 

 ference, but this important recommendation appUes 

 to all. In addition we have : 



1. The selection of varieties resistant to or 

 immime from attack. This is possible in compara- 

 tively few cases at present, but research will show 



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