Stink bug damage to corn occurs widely across Iowa but is mostly seen in fields with winter annual weeds or in corn plants adjacent to weedy fence rows. Basic symptoms of stink bug injury are stunted plants that may grow lateral shoots; wrinkled leaves; holes of various sizes, scattered randomly or in repeating patterns often with a yellow halo; and whorl leaves wrapped tight and failing to expand. Injury is most common on newly emerged plants through the 4th true-leaf stage, but it also may occur on mid-whorl-stage plants.
Iowa State University
Rice, Marlin E., "Stink bugs can twist corn" (2002). Integrated Crop Management News. 1825.
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