A new downy mildew of Impatiens (Plasmopara obducens) found in Germany
The NPPO of Germany recently informed the EPPO Secretariat of the occurrence of Plasmopara obducens, a downy mildew of Impatiens, at two locations (Baden-Württemberg and Saarland).
In September 2004, P. obducens was detected on Impatiens sp. in a cemetery. There was no information about the origin of the infection.
A circular request was sent to regional plant protection services and as a result a notification was received on the occurrence of P. obducens in a cemetery in Saarland during summer 2003. The disease was widespread on Impatiens walleriana. Again, there was no information on the origin of the infection. Since then, no further occurrence has been observed in the cemetery concerned.
The pest status of P. obducens in Germany is officially declared as follows: Present, two single occurrences; under survey.
NPPO of Germany, 2005-08.