The caterpillar larva of a fall armyworm, also known as Spodoptera frugiperda, sits on the damaged leaf of a corn plant 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
