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Forest Research home > Research > Protecting trees > Horse chestnut leaf miner - Cameraria ohridella

Monitoring and research on Horse chestnut leaf miner (Cameraria ohridella)

Help us to monitor the spread of Cameraria ohridella

The spread of C. ohridella is being monitored by collating records received from a wide range of institutions, research organisations and individuals. We are very keen to receive records of C. ohridella in Great Britain and Ireland from any areas not already indicated on our distribution map.

Information about horse chestnut leafminer

Please send records to Instructions for sending in leaf samples can be found in the note below:

Monitoring the spread of Cameraria ohridella - can you help (PDF-204K)

Long-term impact and the potential interaction with other pests and diseases

Even though there is no evidence from Europe that C. ohridella causes a decline in tree health, it is possible that differences in climate or interactions with other pests and diseases might lead to greater impact in the UK.

Consequently, the effects of the moth and its interaction with other pests and diseases, especially bleeding canker of horse chestnut, is being studied through the long-term monitoring of over 300 chestnut trees at several sites in southern England. These trees are assessed twice each year for infestation, disease crown condition, growth and signs of dieback.

Data collected during 2002-2006 have provided a picture of tree condition before the arrival of the moth, and subsequent monitoring will indicate to what extent tree health changes after the moth becomes established and the trees are defoliated.