EPPO Global Database

EPPO Reporting Service no. 10 - 2003 Num. article: 2003/155

Impatiens downy mildew reported in United Kingdom

The NPPO of United Kingdom recently informed the EPPO Secretariat of interceptions and outbreaks of a new disease: impatiens downy mildew (Plasmopara sp.). So far, downy mildew of impatiens had never been reported in UK, although the disease occurs in North America and parts of Europe. The disease was first diagnosed at the Central Science Laboratory on 2003-06-28 on a sample of Impatiens hybrid (‘Mystic Mixed’) intercepted in Sussex. Since then, around 15 outbreaks at nurseries and in planted areas have been found at a range of sites throughout England. Action has been taken on infected plants: destruction of severely affected plants, treatment of the remainder with chlorothalonil, adoption of hygiene precautions regarding movement of potentially infected plants between and within glasshouses and measures to reduce humidity. Work is being done to identify the pathogen and its pathway into the UK.


NPPO of United Kingdom, 2003-09.