Mission: alien moth survey

Survey trees in your area - anywhere in the UK - for invading alien moths

What are you looking for? The damage caused by the leaf-mining moth is often obvious, but it can be confused with other types of damage (see the photo below).

Your mission in brief:

  • Find a horse chestnut tree (see here for help with tree identification).
  • Look at the leaves near the bottom of the tree: can you see whitish blotches, made by the alien moth?
  • Find out the nearest postcode or write down the location so you can find the tree on a map.
  • Use the detailed instructions to decide how badly affected your tree is. 
  • Submit the information to our database, even if your tree is not infected.

Download detailed instructions

  • Smartphone users. You can now part in the Mission: alien moth survey with our Leaf Watch app for iPhones and Android smartphones.

Conker Tree Science Leaf Watch logo

Check out the identification of the alien moth damage. The damage labelled as 'not a leaf miner' is actually a fungus (called Guignardia) that was introduced by accident, but does not seem to do the trees any harm. It is most prevalent in autumn.



Moth hiding (photo: Grahame Madge)
The tiny moths are well camouflaged against bark
(photo: Grahame Madge)