CHAPTER XXII 

 INSECTS AND DISEASES 



THE corn is troubled by a great many- 

 insects and diseases in various sections 

 of the country. However, we do not find 

 all of these insects and diseases common 

 to all sections where sweet corn is grown. 



DISEASES 



Rust. One of the diseases most com- 

 monly mentioned in some sections is the 

 rust. This affects the leaves and the leaf 

 sheath, and in some cases causes consider- 

 able" injury to the development of the 

 tissues. However, on sweet corn it has not 

 become common only in certain sections, 

 and therefore has not received a great 

 amount of attention. 



Smut. Smut is the most common disease 

 on corn throughout the United States. 

 About every field of sweet corn that is 

 planted has on some stalks or ears a 

 large, whitish mass, which increases in size 

 and later in the season turns black, sending 

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