How official guides and qualifications describe tree risk assessment, decay, structural defects and the reports that follow.
26 pages in this topic. Each guide names its sources and the date they were read.
How UK national tree safety guidance, the ISA qualification pages, the QTRA system, a University of Florida publication and a US Forest Service brochure define hazard, risk, target and the levels of tree inspection.
Tree risk assessment has its own methods and its own credentials.
Tree risk assessment has its own methods and its own credentials.
How a California pest note, a Washington State extension sheet, a botanical garden and Forest Research define white, brown and soft rot in trees, and what each source says about strength loss.
A comparison of the wood decay fungi that tree-care and forestry sources describe: the rot each causes, the hosts, where the fruiting body shows, and what the sources say a conk can indicate.
A comparison of the structural defects that a US Forest Service brochure, university extension services, the ISA and UK national tree safety guidance describe: how each source defines a defect and lists the conditions, with one page each.
How the National Tree Safety Group, the USDA Forest Service, the University of Florida and ISA describe the three ways a tree or tree part fails: branch, stem and root, with the conditions each source links to them.
How the National Tree Safety Group and four US publications describe a visual look at a tree: the levels from drive-by to detailed inspection, what parts are examined, and the point where each source names a closer look or an arborist.
How the London Tree Officers Association describes CAVAT, a method that puts a money figure on an amenity tree, and how the i-Tree Eco site describes a tool that reports the value of a tree or a whole urban forest to a community.
What the Occupiers' Liability Acts of 1957, 1984 and 1960, the Health and Safety at Work Act 1974 and the Irish Occupiers' Liability Act 1995 say about the care an occupier or employer owes, and how UK national tree safety guidance describes its use for trees.