Chapter 19

Beer Spoilage Organisms

Molds

Molds are non-chlorophyll-bearing plants that range in size from a single spore to large cell aggregates. Commonly occurring genera are Mucor, Penicillium, Aspergillus, Cladosporium, Geotrichum, and Rhizopus. Most molds are able to grow well at ordinary temperatures, the optimum range being from 25 to 30°C, although some species can grow at 35°C or even higher temperatures and others at much lower temperatures. Molds are normally aerobic organisms and can grow over a wide pH range, although most species prefer an acid pH.

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