"Cocoa is unusually susceptible to disease. Every year, a third of the crop is destroyed by fungi and pests with names like "Witches' Broom," "Frosty Pod Rot," and "Vascular-streak dieback." A few years ago, one of these cocoa diseases hit Brazil. At the time, "Brazil was one of the world's largest cocoa-producing countries," says Laurent Pipitone of the International Cocoa Organization in London. "When this new disease came, it reduced their production by about half."