PROGRESS REPORT ON THE EUROPEAN CORN BORER 
31 
grain may not be appreciable, particularly where this is confined to 
the tip of the ear or to the interior of the cob. 
When the ear is entered from the side or the base the character of 
the damage is similar to that detailed in the preceding paragraph. 
Fig. 12. — Typical injury bv the European corn borer to the grain on the immature ears of 
flint (field) corn. Borers are shown feeding in natural position. The interior of the 
cobs was also badly tunneled by the borers 
The external evidence of infestation, however, usually is more con- 
spicuous, as large masses of f rass are thrown out of the entrance hole 
by the borer, and these become attached to the ear (fig. 11) or the 
lower part of the plant, as has been previously described. 
