Naturally occurring alcohol with a distinctly earthy-musty odor and taste, It is perceived as a typical soil smell, causing the smell of molds and occurs after prolonged rain dryness or on freshly plowed soils. Geosmin is from microorganisms bstimmter bacteria (Myxobacteria and Streptomyces species), which mainly live in the soil. (in the picture fruiting bodies of myxobacteria).
Geosmin is also responsible for the typical smell of beets. There is one in the wine earthy Weak clay as positive and often the characteristic of certain French red wines (see below Stinkerl ). With more pronounced this indicates wine faults how Geranienton. corked or horse sweat out. The human sense of smell is highly sensitive to geosmin; the Perceptual threshold is 0.1 ppb,