• Welcome to the LTOA website

    Welcome to the LTOA website

    The London Tree Officers Association (LTOA) constitutes the professional & technical voice for London's trees & woodlands Read More
  • Become a Sponsor

    Become a Sponsor

    The LTOA relies on subscriptions from its members and sponsorship to operate. Read More
  • CAVAT

    CAVAT

    Capital Asset Value for Amenity Trees (CAVAT). CAVAT provides a method for managing trees as public assets rather than liabilities Read More
  • How to Become a Member

    How to Become a Member

    Members can attend, for free, the the LTOA meetings which are held four times a year and cover a wide range of tree related matters. Read More
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  • Welcome to the LTOA website

    Welcome to the LTOA website

    The London Tree Officers Association (LTOA) constitutes the professional & technical voice for London's trees & woodlands Read More
  • Become a Sponsor

    Become a Sponsor

    The LTOA relies on subscriptions from its members and sponsorship to operate. Read More
  • CAVAT

    CAVAT

    Capital Asset Value for Amenity Trees (CAVAT). CAVAT provides a method for managing trees as public assets rather than liabilities Read More
  • How to Become a Member

    How to Become a Member

    Members can attend, for free, the the LTOA meetings which are held four times a year and cover a wide range of tree related matters. Read More
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The London Tree Officers Association

Welcome to the LTOA website. The London Tree Officers Association (LTOA) constitutes the professional & technical voice for London's trees & woodlands. Its aim is to enhance the management of the Capital's trees.

We hope that you find the LTOA website both interesting & informative. If you have any questions, comments or suggestions, please do not hesitate to contact us.

LTOA update on Ceratocystis platani and reporting process

Ceratocystis platani (plane wilt) is a fungal disease affecting plane trees in some parts of the European mainland including France, Italy and Greece. It only affects plane trees, compromising the vascular system and ultimately leading to the death of the infected tree. It spreads via spores, typically transported from one tree to another by infected equipment such as chainsaws. The disease is not known to be present in the UK. In order to minimise the risk of it entering the country the UK has been designated Protected Zone Status (PZS) by the EU, placing restrictions on imports of plane saplings.

To maintain PZS the UK must demonstrate that we are actively looking for plane wilt and that we have not yet found it. The LTOA have been leading on this project, working for the Forestry Commission to undertake PZS surveys and producing reports in 2014 and 2015. We are currently in the process of undertaking the 2016 survey, due for completion at the end of September. The LTOA are considered to be one of the organisations with the most expertise about the disease, and have presented our results at plant health and urban forestry conferences as well as travelling to Italy to see the pathogen in the field and learn how it is managed.

Reporting mechanisms exist for those who believe that they may have spotted this disease – below is a link to an identification sheet which might assist with this process, however it is important to note that further investigation by a professional will be required in order to confirm the diagnosis. Perhaps the most obvious symptom is significant sections of canopy in the tree where the leaves have become completely desiccated but have been retained on the tree (see photos). It should be further noted that this disease affects only plane trees and will not be found on any species which is not plane.

  • For additional information about plane wilt and other pests and diseases of concern please consult the Observatree website at http://www.observatree.org.uk/
  • If you suspect a case of plane wilt then in the first instance it may be advisable for you to contact the LTOA at This email address is being protected from spambots. You need JavaScript enabled to view it.
  • To formally report a suspected sighting of plane wilt then please use the FC TreeAlert service at http://www.forestry.gov.uk/treealert

A full summary of the LTOA’s work with regard to plane wilt PZS surveys will be presented at the forthcoming National Tree Officer Conference in Telford on November 9th and will form the basis of a publication later in 2016.

For further information please contact John Parker at This email address is being protected from spambots. You need JavaScript enabled to view it.

Download the Ceratocystis Platani Symptoms sheet

National Tree Officers Conference 2017

Help with drafting a conference abstract for a presentation at the National Tree Officers Conference on 8 November 2017 at Telford, Shropshire is available here. The current call for papers will close with your abstract submitted by 5pm on Friday 12 May 2017.

Sponsored by Barcham Trees

How to Become a Member

Members can attend, for free, the LTOA meetings which are held four times a year and cover a wide range of tree related matters.

Click here to find out how to become an associate member