Picking coffee cherries from plants has been both an industry and a way of life in Chiapas, Mexico, for generations. Those who work among the fields now may be the last of their kind, as disease continues to affect the crop, and returns diminish year upon year.
The specific disease which is responsible for the blackening of the leaves visible in this image is coffee leaf rust. It's not only Chiapas which has noticed it; many farms across the south of Mexico and Central America are suffering from the same issue. In some cases, it's reduced the output of coffee leaf crops by half or more, destroying the livelihoods of the people who depend on it. Temperatures have risen in the area in recent years, enabling the fungus responsible for the disease to grow. It used to appear only in crops on lower land; now it's making its way up the hillsides.