Current Tree Health Issues

Details of threats to the wellbeing of our trees.

Brown Tail Moth

With a dramatic increase in recent introductions of new pests and diseases into the UK, it is clear that our trees are facing unprecedented threats. When managing a changing population of living organisms it is essential to be aware of these current and potential threats so that action may be taken if necessary. Some of the main concerns affecting our tree population, along with guidance of what to do if you spot occurrences, are detailed here. If you would like any further information regarding pests and diseases affecting trees contact The Forestry Commission.

  • Brown Tail MothBrown Tail Moth

    Brown Tail Moth

    This page is to provide advice and information on how you can help to prevent the spread of the brown tail moth and prevent you or your family suffering from the painful rash that the caterpillars can cause.

  • Horse Chestnut Bleeding CankerBleeding Canker in Horse Chestnut Trees

    Bleeding Canker in Horse Chestnut Trees

    Bleeding canker in horse chestnuts is a nationwide concern. We have been monitoring it in the borough since 2005 and have needed to remove several trees suffering from it.

  • Chalara Dieback of Ash

    Chalara dieback of ash is a serious disease of ash trees caused by a fungus called Chalara fraxinea (C. fraxinea). The disease causes leaf loss and crown dieback in affected trees, and it can lead to tree death.

  • Oak Processionary Moth (OPM)

    Oak processionary moth (Thaumetopoea processionea) is a species introduced to London from southern Europe in recent years. The caterpillars have thousands of tiny hairs which can cause irritation to human and animal skin and less commonly sore throats, breathing difficulties and eye problems. Severe caterpillar infestations can defoliate trees leading to a reduction in overall tree health.

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