Drought is also thought to be a factor causing dieback in hedgerow trees, which are not included in the UK crown density survey.
A whole plant showing dieback was sent to CSL for diagnosis.
The symptoms on Pieris were an aerial twig dieback (Fig.
dieback symptoms was first described in Zaire in 1989 but the causal agent was not established.
In North America it also causes ramorum dieback or ramorum leaf blight on a range of woodland plants.