The fungus has swept through coffee fields from Mexico to Panama, where some of the world's rarest and most expensive beans are grown.

WSJ: Roya Fungus Hurting Central America Coffee Crops

Roya is making some of the world's most desired coffee beans scarcer and driving up their prices.

WSJ: Roya Fungus Hurting Central America Coffee Crops

But jelly bean fans are not indiscriminate, most often seeking out the red beans, in particular the cherry and strawberry flavored gummy treats.

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