Erysiphe pisiErysiphe pisi is a plant pathogen that causes powdery mildew on several plant species.Distribution and habitatErysiphe pisi has an almost circumglobal distribution and can be found across much of the world where it infects a large variety of host plants many within the family Fabaceae. The powdery mildew caused by this species is most prevalent within regions that experience dry climates, with hot days and cool nights.