| Blumeria graminis | |
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| Genus: | Blumeria
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| Species: | B. graminis
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| Binomial name | |
| Blumeria graminis | |
Blumeria graminis (commonly called barley powdery mildew or corn mildew) is a fungus that causes powdery mildew on grasses, including cereals. It is the only species in the genus Blumeria. It has also been called Erysiphe graminis and (by its anamorph) Oidium monilioides or Oidium tritici.