In Central and South America, witches' broom infestations may cause a loss of up to 90 percent of a farmer's cocoa bean crop, meaning less chocolate for those of us with a sweet tooth. And spruce ...

Everything changed when a fungal infection swept Bahia. The fungus, called witches'-broom, only attacks cacao trees, and it ravaged the chocolate industry in Bahia in the late 1980s and early '90s.