sourceTaxonName: Erysiphe polygoni
targetTaxonName: Beta vulgaris
localityName: United States
referenceCitation: Jacobsen, B. , Johnston, M.R., and Weltzien, H.C.. 2005. Occurrence of the perfect stage of powdery mildew of sugar beets in southern Montana in 2003. Pl. Dis. 89:1362