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First report of Peronospora digitalidis causing downy mildew disease on foxglove in Oregon.

Diversity of root-knot nematodes of the genus Meloidogyne Göeldi, 1892 (Nematoda: Meloidogynidae) associated with olive plants and environmental cues regarding their distribution in southern Spain.

Wallace, E. C. ; Crouch, J. A.

Plant Disease 2018 Vol 102 No. 4 pp. 827;

Abstract

In the spring of 2017, foxglove (Digitalis purpurea) plants with angular chlorotic and necrotic lesions characteristic of downy mildew disease were observed in a commercial greenhouse in Washington County, Oregon, USA. The disease was identified and treated early but still caused losses of 5% to the foxglove crop. Pathogen hyphal growth on the abaxial leaf surface created a fuzzy appearance. Based on morphological characteristics, host incidence, nucleotide sequence analysis and pathogenicity tests, the causal agent was identified as Peronospora digitalidis [P. digitalis]. This disease was first observed in the USA on the coast of central California in 2002. This is thought to be the first report of downy mildew on foxglove in Oregon.