The website of Jerry Dicker, working professionally in arboriculture since 1997

Contact details -
Telephone: 01454 416 945   Mobile: 07798 741872  Email:
Address: 50 High Street, Thornbury, BS35 2AN

My name is Jerry Dicker and I have been working professionally in arboriculture since 1997. I am a member of the Arboricultural Association, the International Society of Arboriculture,the Small Woods Association and the Field Studies Council. 

I hold insurance for professional indemnity (£2,000,000), public liability (£5,000,000) and employers liability (£5,000,000). I continue to do practical tree work, surveys, inspections and reports in my local area. This website aims to advertise the following services more widely.

Tree decay detection

I was one of the first in the UK to use the Picus Sonic Tomograph. This relatively new technology gives a cross sectional scan or "map" of decay within the tree using a virtually non-invasive method. I also use the IML Resistograph, a sophisticated microdrill which reveals the hardness of the wood inside the tree. I also run courses on tree identification and related measures

For more on the PICUS Sonic Tomograph click on a link below; 

How it works 

Clients - recent and current 


Argus Electronic - the designer and manufacturer in Germany at

Sorbus International Ltd, the UK agents for Picus and Resistograph at  

Arboricultural Information Exchange  - a great tree site at