Peronosporea
Peronospora is a genus of oomycetes from the Peronosporaceae family with 260 species. They are widely known as downy mildew since most species produce this kind of disease. These plant pathogens are notorious for causing great damage to several crops, ornamental plants, and wild plants. Most species are highly specific to their hosts. Examples of this are the specie that causes blue mold on tobacco plants, another for sweet onion, and even one specific to opium poppy. Their potentially devastating nature is so significant they have even been classified as a bioweapon. These fungi-like molds prefer humid air and cool temperatures and spread by wing, which allows for effortless dispersion over large areas.
