Barrell On ... Guides to tree risk show stark contrast

Last year saw the publication of two eagerly-awaited guides on managing tree risk.

Organised from the USA, the International Society of Arboriculture (ISA) convened a group of more than 50 international experts to produce a best-management practice document called Tree Risk Assessment ( It focuses on the practicalities of inspecting trees and purposely steers away from broader risk management.

In the UK, the National Tree Safety Group (NTSG) took a different approach, with an emphasis on principles rather than practical details. Its composition was different, too, dominated by stakeholders with a vested interest in the contents of a tree-management guidance document. Published under the title Common Sense Risk Management of Trees (, this initiative aspires to "develop a nationally-recognised approach to tree safety management".

As a practical guide to help tree inspectors identify problems and decide what to do, the ISA document is an obvious success. It is intuitively structured, which makes it easy to follow, and its language is pitched to communicate effectively on a practical level. This is a technical publication that is easy to understand for those inspecting trees on a daily basis. In short, it is a useful contribution.

In contrast, the NTSG document is a confounding mixture of muddlement and confusion, interspersed with occasional glimpses of brilliance that are undoubtedly its saving grace. In particular, the section on the law is not to be missed, but the rest fails to match that standard. This inconsistency makes it a work in progress rather than the finished article. But is improvement possible?

It is rumoured that there will soon be a new NTSG steering group, but drastic changes will be needed if it is to move forward. The ISA model may offer some clues. Get rid of the influences of vested interest, bring in the experts who know about the detail, take proper account of the legal context and find an independent leader to take control. The NTSG was a well-intended experiment that has not delivered. It is not over yet, but now it has to evolve or surely fail.

Jeremy Barrell is managing director of Barrell Tree Consultancy.

Have you registered with us yet?

Register now to enjoy more articles and free email bulletins

Sign up now
Already registered?
Sign in

Before commenting please read our rules for commenting on articles.

If you see a comment you find offensive, you can flag it as inappropriate. In the top right-hand corner of an individual comment, you will see 'flag as inappropriate'. Clicking this prompts us to review the comment. For further information see our rules for commenting on articles.

comments powered by Disqus

Read These Next

Horticulture education update - staying on course

Horticulture education update - staying on course

Raised levels of investment in horticulture education and increased student take-up is welcome news for the industry, says Rachel Anderson.

Tree planting guide - three basic rules

Tree planting guide - three basic rules

Choosing the right plant, correct planting procedure and best aftercare are the three basic rules for sucessful tree planting, Sally Drury explains.

Tree planting - what are the benefits of planting trees?

Tree planting - what are the benefits of planting trees?

Mitigating climate change, providing windbreaks and reducing the risk of soil erosion are some of the best reasons for planting trees, says Sally Drury.

Follow us on:
  • Facebook
  • LinkedIn
  • Twitter
  • Google +
Horticulture Jobs
More Horticulture Jobs

Arboriculture Contracts & Tenders

Jeremy Barrell On...

Jeremy Barrell

Tree consultant Jeremy Barrell reflects on the big issues in arboriculture.

Products & Kit Resources