We use some essential cookies to make this website work.
We’d like to set additional cookies to understand how you use forestresearch.gov.uk, remember your settings and improve our services.
Preparing to search
This project aims to quantify the impact of horse chestnut leaf miner (Cameraria ohridella) on the growth and health of horse chestnut trees (trees in the Aesculus genus), and to determine whether impact is increased or decreased through interactions with bleeding canker, a disease caused by the bacterial pathogen Pseudomonas syringae pvar. aesculi.
Specific research objectives are to:
Data collected over the 10 years from 2002 to 2012 show that although Cameraria ohridella can damage up to 75% of the total leaf area of white horse chestnut (Aesculus hippocastanum), it has no influence on stem radial growth or general tree condition. Red horse chestnuts (Aesculus × carnea) are rarely attacked by the moth, and then only when growing close to heavily infested white horse chestnuts.
In contrast, bleeding canker disease caused the death or removal of 11% of white horse chestnuts and 27% of red horse chestnuts. Trees that were infected by the disease, but were still alive, showed a decrease in growth and a decline in crown condition.
There was no evidence that the presence of Cameraria ohridella or the damage it caused either facilitated the spread of bleeding canker disease or accentuated the impact of the disease. In fact the opposite was observed: trees with the highest rates of leaf miner infestation tended to have the lowest incidence of bleeding canker disease.
This project started in 2002 and data collection has continued. An update will be published when the next 10 years’ data have been fully collected and analysed.
D’Costa L, Koricheva K, Straw N & Simmonds M (2013) Oviposition patterns and larval damage by the invasive horse-chestnut leaf miner Cameraria ohridella on different species of Aesculus. Ecological Entomology 38, 456–462.
Pocock M., Evans D, Straw N. & Polaszek A (2011) The horse chestnut leaf miner and its parasitoids. British Wildlife 22, 305-313.
Straw N & Tilbury C (2006) Host plants of the horse-chestnut leaf-miner (Cameraria ohridella), and the rapid spread of the moth in the UK 2002-2005. Arboricultural Journal 29, 83–99.
Straw N & Bellett-Travers M (2004) Impact and management of the horse chestnut leaf-miner, (Cameraria ohridella). Arboricultural Journal 28: 67–83.
See also the Conker Tree Science Project.
This work is funded by the Forestry Commission under the Programme of Advice and Scientific Support for Tree Health.
Forestry Commission policy
This research underpins the evidence base for the delivery of healthy and resilient forests and wider ecosystems which is part of the Tree Health and Plant Biosecurity Action Plan.
Cookies are files saved on your phone, tablet or computer when you visit a website.
We use 3 types of cookie. You can choose which cookies you're happy for us to use.
These essential cookies do things like remember your progress through a form. They always need to be on.
We use Google Analytics to measure how you use the website so we can improve it based on user needs. Google Analytics sets cookies that store anonymised information about: how you got to the site the pages you visit on forestresearch.gov.uk and how long you spend on each page what you click on while you're visiting the site
Some forestresearch.gov.uk pages may contain content from other sites, like YouTube or Flickr, which may set their own cookies. These sites are sometimes called ‘third party’ services. This tells us how many people are seeing the content and whether it’s useful.