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A major agricultural pest, the moth Helicoverpa zea and its caterpillar go by many common names, depending on the crop they feed on: Shown here is a "corn earworm." (Photo courtesy of José Roberto Peruca) A major agricultural pest, the moth Helicoverpa zea and its caterpillar go by many common names, depending on the crop they feed on: Shown here is a "corn earworm."