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
Horse chestnut trees (Aesculus hippocastanum) are susceptible to several well-known pests and pathogens that cause symptoms other than bleeding canker.
Caused by the fungus Guignardia aesculi, the disease produces reddish or dull brown, irregular blotches that are often concentrated at the tips and margins of infected leaflets. The blotches are often outlined by a conspicuous yellow band (see the photo). Occasional browning without the yellow margin may be caused by ‘xylem limited’ bacteria.
Wood rotting fungi, such as Ganoderma and Armillaria frequently cause decay on mature trees.
Scattered dead and drooping shoots on horse chestnut trees usually indicates damage by squirrels.
Circular white spots visible on trunks or large branches (and sometimes mistaken for pigeon droppings) are actually the insect Pulvinaria regalis. This pest is mainly found disfiguring trees in urban localities.
Cameraria ohridella is a leaf mining moth that attacks the leaves of horse chestnut. Please read our leaf miner resource pages about this pest to find out more.
Cookies are files saved on your phone, tablet or computer when you visit a website.
Find out more about cookies on forestresearch.gov.uk
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.