Tree Health Diagnostic and Advisory Service

Range of services:

Diagnostic service

Photo of culturing in the laboratory

  • Woodlands in both public and private ownership
  • Trees on farmland, in hedgerows, shelterbelts and screens
  • Christmas tree plantations
  • Trees in forest and horticultural nurseries
    Publicly owned amenity trees
  • Privately owned amenity trees subject to a Tree Preservation Order (TPO) or situated in a Conservation Area.

Flat rate charge for the initial investigation which in many cases may be all that is needed to resolve the problem. Additional work, which may involve culturing from specimens or a site visit, will incur additional charges but will not be undertaken without the prior agreement of the customer.

Please use our standard Report Form and Supplementary Sheet (below) for written and email requests:

Reporting suspected cases of Chalara die back of ash

If you are reporting a suspected case of Chalara die back of ash, please use TreeAlert.

There is no fee associated with this service.

Further information on Chalara die back of ash and details on symptoms guidance.

Identification service

  Photo of laetiporus growth
  • Fungal fruit bodies
  • Pathogens obtained from diseased specimens by culturing or incubation
  • Fungi supplied as pure cultures.




Advisory service


Bleeding in crown of horse chestnutGeneral information and advice, usually free of charge, on all aspects of tree disease and disorders and allied subjects. If the problem falls outwith our area of interest we can often direct inquirers to our specialists in Forest Research or in other establishments.

Advisory service standards of service

Explaining some of our work on video

What's of interest

For enquiries north of the Humber/Mersey line:

Tree Health Diagnostic and Advisory Service
Forest Research
Northern Research Station
Midlothian EH25 9SY


For enquiries south of the Humber/Mersey line:

Tree Health Diagnostic and Advisory Service
Forest Research
Alice Holt Lodge
Surrey GU10 4LH