Aspergillus is a genus of molds which particularly enjoy sugar. Many species grow easily on starchy foods such as bread. Some are noted for growing in areas with few nutrients, such as damp walls. These species are a major component of mildew.
Some species are used in food production, for example they are involved in making sake.
Other species are pathogenic, causing serious diseases in people. Some species produce mycotoxins.
People often develop allergies to molds of this genus.