CHAPTER VII 



Insects and Diseases 



So much has been said and written during the last 

 fifteen years about various methods of combating 

 insects and diseases that it seems hardly justifiable 

 to take up space with what must necessarily be a 

 very brief and incomplete treatment. Entire books 

 have been written about the pests affecting different 

 groups of plants. Bulletin after bulletin by the 

 various experiment stations has been published 



A BARREL SPRAY OUTFIT 



upon the subject, and one can scarcely pick up a 

 horticultural or farm paper without finding some 

 article having to do with the injury done by some 

 insect or disease and the remedy for the same. 

 Too much emphasis has been placed on mere 

 methods of treatment and too little upon the neces- 

 sity for some knowledge of the insect or the 

 disease itself. The nature and habits of the 



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