Forestry Commission logo

Forest Pests and Diseases

Phytophthora Ramorum  This page provides brief information and links to information about forest pests and diseases that may be of interest to people living and working in North West England

Chalara dieback of ash is a serious disease of ash trees caused by a fungus called Chalara fraxinea (C. fraxinea), including its sexual stage, Hymenoscyphus pseudoalbidus (H. pseudoalbidus). The disease causes leaf loss and crown dieback in affected trees, and usually leads to tree death.

Phytophthora Ramorum  is causing an ongoing and fast changing outbreak of this fungus like pathogen on Larch across parts of the UK including Cumbria.

We now have a list of agents qualified to deal with Phytophthora ramorum.

Acute Oak Decline

This has been found in several places across south east England and parts of Wales. So far it has not been found in North West England.

Corsican pine infested with Red Band Needle Blight Red Band Needle Blight

This has been found in a number of forests across North West England. Whilst it has been found on a range of conifer species it is most commonly found on Pine species.

In response to this disease we are no longer planting Corsican Pine and limiting our planting of Scost Pine. We are also trying to thin all our Pine woodlands as research suggest that more airflow through the forest canaopy reduces the infection.

Further Information

Please visit Forestry Commission Plant Health for information on all forest health matters.


England's Woods and Forests are cared for by Forest Enterprise England, an agency of the Forestry Commission.