The damaged leaves of corn plants caused by an infestation of fall armyworms, also known as Spodoptera frugiperda, stand on a farm north of Pretoria, South Africa, on Friday, Feb. 10, 2017. The fall armyworms that have ravaged corn fields from Ghana to South Africa since arriving on the continent last year could spread to Asia and the Mediterranean, a research body said. Photographer: Waldo Swiegers/Bloomberg via Getty Images
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