Taking part

Take part in the Mission: pest controllers 2020

Discover the full instructions

Instructions in brief

Between 4th and 13th July (inclusive)

  • Pick a leaf from a conker tree that is infected with leaf miners.
  • Seal it in a bag (a ziplock food bag is ideal), so even tiny insects cannot escape.
  • Keep it somewhere cool for two weeks.

Between 18th and 24th July

  • After two weeks, the insects inside will have hatched out.
  • Count the moths and the natural pest controllers, and send us your results. (Instructions for sending result will be available on 18th July.)

Sign up

Sign up to receive more information as well as information about our brand new forthcoming project Nature Up Close & Personal. 

Take part in ongoing recording of the leaf miner

You can record damage caused by the leaf-mining moth. We are especially interested in its spread northwards, so would love photographic records from north of the line from Newcastle to Lancaster.

As well as this website, you can use our LeafWatch app to take part in recording.

Find out about the missions

Find out about the missions which ran from 2010-2013 and read about the discoveries in a scientific paper.


Find out how Conker Tree Science can be used in class projects.

Discover more

Find out more about our horse-chestnut trees and the problems they are facing.

What is the future for our horse-chestnut trees?

Find out what the future might hold for our horse-chestnut trees.