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Byline: Mac Margolis; With Manuela Zoninsein in Beijing
Poor nations are now starting to shake off the old 'Frankenfood' taboo.
Africa is no stranger to scourges, but few cause as much ruin as maize streak virus. Spread by the tiny leafhopper bug, MSV plagues farmers across the southern part of the continent, where tens of millions rely on corn for more than half their daily calories. It starts discreetly: a patina of pale circles at the bottom of young leaves. Left untreated, it can destroy entire harvests. "You go into the fields and want to weep," says Jennifer Thomson, a South African molecular biologist and expert on MSV. "You wonder why anyone ...