La Roya: The Fungus That Rewrote Coffee's Map

In a single growing season, an estimated US$500 million was stripped from Central America's coffee economy — and roughly 374,000 harvesting jobs disappeared with it. This was La Roya — coffee leaf rust — and the 2012 outbreak was the worst the region had ever recorded.

A Disease With Deep Roots

Coffee leaf rust is caused by the fungus *Hemileia vastatrix*. It is not new to Central America: the disease first arrived in the region in 1976, decades after it had already reshaped coffee industries elsewhere. For a generation, growers lived with it. Then, in 2012, the fungus returned with intensities higher than previously observed anywhere in the region.

The Scale of the Damage

The 2012-13 epidemic swept Central America and Mexico. By 2013, production across Central America had fallen 16 percent compared with 2011-12 levels. The International Coffee Organization put total damage at 2.7 million bags, costing the region around US$500 million. The crisis did not arrive alone: falling international coffee prices between 2011 and the end of 2013 compounded the blow, leaving farmers squeezed from both directions at once.

A Food Security Crisis in Disguise

Behind every damaged bag was a person. The epidemic had direct impacts on the livelihoods of thousands of smallholders and harvesters. In Central America, coffee is often the only source of income used to buy food and supplies for cultivating basic grains — there is no backup crop, no off-season wage. When the harvest shrank, the work shrank with it: roughly 374,000 jobs were estimated lost in 2012-13 alone, as labor used to pick a diminished crop was simply not needed. The knock-on effects reached beyond income. Because so many families depended on coffee earnings to purchase food, the epidemic carried indirect impacts on food security across the region.

What La Roya Reveals

For specialty coffee, the 2012 outbreak is more than agricultural history. It exposed how exposed the supply chain for Central American coffees can be — and how quickly a single pathogen can collapse the livelihoods of the smallholders who grow the region's most celebrated lots. Traceability means little if the farm behind the label cannot survive the next epidemic. La Roya rewrote Central America's coffee map; the conditions that allowed it to do so have not gone away.