European corn borer in ear shank
Second-generation European corn borers can cut into the ear shank and cause the ears to fall to the ground.
This image appears in the following articles:Corn borers -- same song, second verse (August 1996)
Corn borers reduce yields before harvest (October 1996)
University performance data for BT corn (March 1997)
Yield losses from corn borers (April 1997)