A cup taint with the strong smell of raw potato, caused by a bacteria that then triggers a pyrazine reaction, resulting in the off flavor. This affects coffees from RwandaA Bourbon cultivar variant from Rwanda and Burundi. Bourbon coffees are named for the island in the India Ocean where French colonists grew it. Some history from the..., BurundiBurundi coffee bears resemblance to neighboring Rwanda, in both cup character, but also the culture surrounding coffee. Burundi is a small landlocked country at the crossroads of East... and other countries near Lake Kivu:
Research conducted by CIRAD and OCIBU over a six year period in Burundi has shown this off-flavor to be caused by a fungal agent that enters the cherry
Either a flavor in the coffee, or referring to the fruit of the coffee tree, which somewhat resembles a red cherry.: Either a flavor in the coffee, or... skin and produces a pyrazine chemical toxin that binds to the forming green beans.
They first thought it was caused by a bacterial transmission via an insect vector, the Antestia bug that pierces the coffee cherryOriginally coffee literature referred to the fruit of the tree as a "berry" but in time it became a cherry. It is of course neither. Nor is the... wall and sucks sugars; but later they concluded that anything that pierces the cherry wall can allow the bacteria to enter and eventually release the the nasty pyrazine-based toxin, including the insect.
Because you can’t detect it until you roast it, this defectIn coffee, a defect refers to specific preparation problems with the green coffee, or a flavor problem found in the cupping process. Bad seeds in the green coffee... is a real bummer for roasting companies and a real challenge for research.
