KWS

Bacterial leaf spots

Causal agent: Pseudomonas syringae
Symptoms: Brown to black spots of irregular form and size mainly on the leaf edges or in hollows of the leaf blade. The dead tissue in the centre of the spots often becomes brittle. The damage incurred can recover under dry and warm conditions.
Epidemiology: Wet and cool weather conditions over a longer period of time favour infection. The pathogen penetrates the leaf tissue through fissures or wounds (caused by hail or insects).
Risks: Longer periods of rain, damage to the leaf
Economic importance: Minor
Control: No control measures have been developed.

KWS