Powdery mildew
- kingdom: Fungi
- phylum: Ascomycota
- class: Leotiomycetes
- order: Erysiphales
- family: Erysiphaceae
- genus: Blumeria
- species: Blumeria graminis
Montréal
Quebec
CanadaHauho
Helsinki
Karjalohja
Central Finland
FinlandAmes
IowaCambridge
Somerville
Wellesley
MassachusettsCayuga Heights
East Ithaca
Ithaca
South Hill
Syracuse
New York
United States