sourceTaxonName: Erysiphe polygoni
targetTaxonName: Beta vulgaris
localityName: United States
referenceCitation: Ruppel, E.G., Hills, F.J., and Mumford, D.L.. 1975. Epidemiological observations on the sugarbeet powdery mildew epiphytotic in western U.S.A. in 1974. Pl. Dis. Reporter 59:283-286