Distribution of the Northern Corn Rootworm 
Diabrotica longicorms 
eC 
aves Reg 
yy Bie 
aS 
Bey. oe 
YZ, 1955 
RAN) 1966 
1970 
\. 
Distribution of the Western Corn  Rootworm 
ey 
i! 
WA\955 
= 1960 
NN 1965 
1970 
COVER ILLUSTRATION — Northern corn rootworm adult (lower left) and western corn rootworm adult (upper right). Photo by Wilmer Zehr. 
