INSECT ENEMIES AND PLANT DISEASES 181 
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 
Lay 
ADULT OF SEED CORN MAGGOT 
Phorbia Fusciceps 
suid 
LARVAE OF SEED CORN MAGGOT 
Phorbia Fusciceps 
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 
