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  • Breadcrumb

    1. Home
    2. Environment and the outdoors
    3. Forests and outdoor recreation
    4. Forests

    Tree disease

    It is important that you take care when visiting forests and act properly to stop the spread of tree disease.

    Ash Dieback Disease

    Ash Dieback is a disease of ash trees caused by the fungus Chalara fraxinea. The disease causes leaf loss and crown dieback in affected trees and can cause tree death.

    Ash Dieback has been identified in young ash saplings at several sites in Northern Ireland. Read more information about this disease:

    • Ash Dieback disease

    Phytophthora lateralis (P. lateralis)

    Phytophthora lateralis infects tree roots which come into contact with spores in the soil or water. It kills most Lawson cypress trees it infects. P. lateralis is in a number of public forests, including:

    • Tollymore Forest Park
    • Mourne Forest
    • Somerset Forest

    A very small number of affected trees have also been identified in Castlewellan Forest Park and Belvoir Park Forest.

    Controlling the spread of P. lateralis is ongoing. Public access to certain areas of these forests is restricted to prevent soil movement. Users of the forests are asked to pay attention to the signage and stay on the way marked paths.

    Identifying Lawson cypress trees and P. lateralis

    Anyone concerned about Lawson cypress trees should look at the guide to identify Lawson cypress trees and symptoms of P. lateralis

    If landowners are concerned about the disease, they should send their name, address, telephone number and a photograph of the tree to:

    • email: daera.helpline@daera-ni.gov.uk

    Phytophthora ramorum (P. ramorum)

    P. ramorum has the potential to cause serious damage to woodlands and plants in the wider environment.

    Identifying Japanese larch trees and P. ramorum

    The first sign of the disease on Japanese larch trees is a visible wilting of young shoots and foliage. Later in the growing season, signs of the disease include withered shoot tips with yellowing needles which then become blackened. The infected shoots shed their needles prematurely. Trees may also have bleeding cankers on their upper trunks.

    All woodland owners and managers are asked to look out for symptoms of the disease in Japanese larch. They should report suspicious symptoms to Forest Service on the following number:

    • phone: 028 9052 4480

    More information on the disease is available:

    • Ramorum disease (Phytophthora ramorum)

    Prevention of tree disease

    Tree disease can be spread in many ways, including:

    • on footwear
    • on vehicle wheels
    • on tools and machinery
    • by the movement of infected plants
    • in rain, mists and air currents

    If you’re visiting a forest, pay attention to signs showing what you should do to stop the spread of tree disease.

    In forests you should:

    • avoid any action which could move infected soil or plant parts to uninfected areas
    • stay on forest roads
    • keep dogs on leads
    • remove soil and mud from shoes and boots before leaving the woodland

    More useful links

    • Forests
    • Parks and green spaces
    • DAERA forestry grants
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    Forests

    • Activities in forests
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    • Private woodlands, plant health, grants and funding
    • Public forests in Northern Ireland
    • Squirrel pox
    • Tree disease

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