INSECT ENEMIES AND PLANT DISEASES 131 



house fly. Severe injuries by this insect are unusual, and 

 there is no known method of preventing them. 



INSECTS ATTACKING THE ROOTS 



The Corn Root Louse (Aphis) : Every farmer has noticed 

 the little blue insects clustered in great numbers on the 



ADULT OF SEED COEN MAGGOT 

 Phorbia Fuseiceps 



LAEVAE OF SEED COEN MAGGOT 

 Phorbia Fuseiceps 



roots of the corn. They feed on the juice of the corn root, 

 and if present in large numbers sometimes kill the plant. 

 Later in the season another kind of aphis is found on the 



