Cookies on Plantwise Knowledge Bank

Like most websites we use cookies. This is to ensure that we give you the best experience possible.


Continuing to use means you agree to our use of cookies. If you would like to, you can learn more about the cookies we use.

Plantwise Knowledge Bank

Your search results

Pest alerts

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

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

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


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.