An arborist, or (less commonly) arboriculturist, is a professional in the practice of arboriculture, which is the cultivation, management, and study of individual trees, shrubs, vines, and other perennial woody plants. An informal term is 'tree surgeon'. Arborists generally focus on the health and safety of individual plants and trees, rather than managing forests (the domains of Forestry and Silviculture) or harvesting wood. An arborist's scope of work is therefore distinct from that of either a forester or a logger, though the professions share much in common.
Scope of work
To work near power wires either additional training is required for arborists or they need to be Certified Line Clearance trimmers or Utility Arborists (there may be different terminology for various countries). There is a variety of minimum distances that must be kept from power wires depending on voltage, however the common distance for low voltage lines in urban settings is 10 feet (about 3 metres).
Arborists who climb (as not all do) can use a variety of techniques to ascend into the tree. The least invasive, and most popular technique used is to ascend on rope. When personal safety is an issue, or the tree is being removed, arborists may use 'spikes', (also known as 'gaffs' or 'spurs') attached to their chainsaw boots with straps to ascend and work. Spikes wound the tree, leaving small holes where each step has been.
An arborist's work may involve very large and complex trees, or ecological communities and their abiotic components in the context of the landscape ecosystem. These may require monitoring and treatment to ensure they are healthy, safe, and suitable to property owners or community standards. This work may include some or all of the following: planting; transplanting; pruning; structural support; preventing, or diagnosing and treating phytopathology or parasitism; preventing or interrupting grazing or predation; installing lightning protection; and removing vegetation deemed as hazardous, an invasive species, a disease vector, or a weed.
Arborists may also plan, consult, write reports and give legal testimony. While some aspects of this work are done on the ground or in an office, much of it is done by arborists who climb the trees with ropes, harnesses and other equipment. Lifts and cranes may be used too. The work of all arborists is not the same. Some may just provide a consulting service; others may perform climbing, pruning and planting: whilst others may provide a combination of all of these services.
Arborists gain qualifications to practice arboriculture in a variety of ways and some arborists are more qualified than others. Experience working safely and effectively in and around trees is essential. Arborists tend to specialize in one or more disciplines of arboriculture, such as diagnosis and treatment, climbing and pruning, cabling and lightning protection, or perhaps consultation and report writing. All these disciplines are related and some arborists are very well experienced in all areas of tree work, but not all arborists have the training or experience to properly practice every discipline.
Many arborists choose to pursue formal certification, which is available in some countries and varies somewhat by location. An arborist who holds certification in one or more disciplines may be expected to participate in rigorous continuing education requirements to ensure continuous improvement of skills and techniques.
In Australia arboricultural education and training are streamlined countrywide through a multi-disciplinary vocational education, training, and qualification authority called the Australian Qualifications Framework, which offers varying levels of professional qualification.
In France a qualified arborist must hold a Management of Ornamental Trees certificate, and a qualified arborist climber must hold a Pruning and Care of Trees certificate; both delivered by the French Ministry of Agriculture.
In the UK an arborist can gain qualifications up to and including a Masters degree. Generally most arborists only attain chainsaw related safety certificates (NPTCs) in addition to the practical qualifications offered by many land-based colleges. College-based courses include further education qualifications, such as national certificate, national diploma, while higher education courses in arboriculture include foundation degree, bachelors degree and masters degree.
In the USA and Canada a Certified Arborist (CA) is a professional who has over three years of documented and verified experience and has passed a rigorous written test from the International Society of Arboriculture. Other designations include Municipal Specialist, Utility Specialist and Board Certified Master Arborist (BCMA). The USA and Canada also have college based training which if passed will give the certificate of Qualified Arborist. The Qualified Arborist can then be used to offset partial experience towards the Certified Arborist.
Consulting Arborists: Arborists who have been in the field for a number of years often choose to become consultants. This is a special area of arboriculture, and the body responsible for certification of a Consulting Arborist (giving the RCA or Registered Consulting Arborist) is the ASCA (American Society of Consulting Arborists).
Tree Risk Assessor: a recent certification, and one driven by accidents in the industry. This is now required by law in a few areas but recommended anywhere.
Trees in urban landscape settings are often subject to disturbances, whether human or natural, both above and below ground. They may require care to improve their chances of survival following damage from either biotic or abiotic causes. Arborists can provide appropriate solutions, such as pruning trees for health and good structure, for aesthetic reasons, and to permit people to walk under them (a technique often referred to as "crown raising"), or to keep them away from wires, fences and buildings (a technique referred to as "crown reduction"). Timing and methods of treatment depend on the species of tree and the purpose of the work. To determine the best practices, a thorough knowledge of local species and environments is essential.
There can be a vast difference between the techniques and practices of professional arborists and those of inadequately trained tree workers who simply "trim trees". Some commonly offered "services" are considered unacceptable by modern arboricultural standards and may seriously damage, disfigure, weaken, or even kill trees. One such example is tree topping, lopping, or "hat-racking", where entire tops of trees or main stems are removed, generally by cross-cutting the main stem(s) or leaders, leaving large unsightly stubs. Trees that manage to survive such treatment are left prone to a spectrum of detrimental effects, including vigorous but weakly attached regrowth, pest susceptibility, pathogen intrusion, and internal decay.
Pruning should only be done with a specific purpose in mind. Every cut is a wound, and every leaf lost is removal of some photosynthetic potential. Proper pruning can be helpful in many ways, but should always be done with the minimum amount of live tissue removed.
In recent years, research has proven that wound dressings such as paint, tar or other coverings are unnecessary and may harm trees. The coverings may encourage growth of decay-causing fungi. Proper pruning, by cutting through branches at the right location, can do more to limit decay than wound dressing.
Chemicals can be applied to trees for insect or disease control through soil application, stem injections or spraying. Compacted or disturbed soils can be improved in various ways.
Arborists can also assess trees to determine the health, structure, safety or feasibility within a landscape and in proximity to humans. Modern arboriculture has progressed in technology and sophistication from practices of the past. Many current practices are based on knowledge gained through recent research, including that of the late Alex Shigo, considered one "father" of modern arboriculture.
Legal issues for arborists
Depending on the jurisdiction, there may be a number of legal issues surrounding the practices of arborists, including boundary issues, public safety issues, "heritage" trees of community value; and "neighbor" issues such as ownership, obstruction of views, impacts of roots crossing boundaries, nuisance problems, disease or insect quarantines, and safety of nearby trees.
Arborists are frequently consulted to establish the factual basis of disputes involving trees, or by private property owners seeking to avoid legal liability through the duty of care. Arborists may be asked to assess the value of a tree in the process of an insurance claim for trees damaged or destroyed, or to recover damages resulting from tree theft or vandalism. In cities with tree preservation orders an arborist's evaluation of tree hazard may be required before a property owner may remove a tree, or to assure the protection of trees in development plans and during construction operations. Carrying out work on protected trees and hedges is illegal without express permission from local authorities, and can result in legal action including fines. Homeowners who have entered into contracts with a homeowner's association (see also Restrictive covenants) may need an arborist's professional opinion of a hazardous condition prior to removing a tree, or may be obligated to assure the protection of the views of neighboring properties prior to planting a tree or in the course of pruning. Arborists may be consulted in forensic investigations where the evidence of a crime can be determined within the growth rings of a tree, for example. Arborists may be engaged by one member of a dispute in order to identify factual information about trees useful to that member of the dispute, or they can be engaged as an expert witness providing unbiased scientific knowledge in a court case. Homeowners associations seeking to write restrictive covenants, or legislative bodies seeking to write laws involving trees, may seek the counsel of arborists in order to avoid future difficulties.
Before undertaking works in the UK, arborists have a legal responsibility to survey trees for wildlife, especially bats, which are afforded particular legal protection. In addition, any tree in the UK can be covered by a tree preservation order and it is illegal to conduct any work on a tree, including deadwooding or pruning, before permission has been sought from the local council.
Arborist training, reference materials, and continuing education
- Arboriculture: Integrated Management of Landscape Trees, Shrubs, and Vines, 4th edition (Harris et al. ) – the standard text for introductory arboriculture, and the primary reference for working arborists.
- ANSI A300 standards for tree care operations (TCIA, all parts) – industry standards.
- ANSI Z133.1 standard for tree care operations (ISA) – industry standards.
- ANSI Z60 standard for nursery stock (ANLA) – industry standards.
- Best Management Practices (ISA, all topics)
- Plant Health Care for Woody Ornamentals (Lloyd et al.)
- Abiotic Disorders of Landscape Plants—A Diagnostic Guide (Costello et al.)
- Trees and Development: A Technical Guide to Preservation of Trees During Land Development (Matheny and Clark)
- Manual of Woody Landscape Plants (Dirr)
- An Illustrated Guide to Pruning, 2nd edition (Gilman)
- Principles and Practice of Planting Trees and Shrubs (Watson and Himelick)
- Arborists’ Certification Study Guide (Lilly)
- Plant Physiology (Kozlowski)
- Urban Soils: Applications and Practices (Craul)
- A New Tree Biology (Shigo) – the classic text by the man widely considered the father of modern arboriculture, Alex Shigo.
- The Landscape Below Ground; Parts I and II (Neely and Watson)
- Arboriculture and the Law (Merullo)
- Trees and Building Sites Conference Proceedings (Watson and Neely)
- The Art and Science of Practical Rigging (Donzelli et al.)
- A Photographic Guide to the Evaluation of Hazard Trees in Urban Areas (Matheny and Clark)
- Diseases of Trees and Shrubs (Sinclair et al.)
- Evaluating Tree Defects (Hayes)
- Guide for Plant Appraisal, 9th edition (CTLA)
- Insects That Feed on Trees and Shrubs (Johnson et al.)
- Tree Structure and Mechanics Conference Proceedings: How Trees Stand Up and Fall Down (Smiley et al.)
- Journal of Arboriculture – (academic research periodical.)
- Pesticide information: www.greenbook.net and www.pesticideinfo.org
- Urban Forestry: Planning and Managing Urban Greenspaces (Robert Miller)
- Natural Disaster Damage to vegetation
Other significant study materials and references for arborists include:
- USDA Soil Surveys
- Soil Science (Hausenbuiller)
- Urban Soil in Landscape Design (Craul)
- Built Environment (Bartuska)
- Design with Nature (McHarg)
- Principles and Applications of Soil Microbiology (Sylvia et al.)
- The Biology of Symbiotic Fungi (Cooke)
- Mycology – Plant Pathology Internet Guide Book (Kraska)
- Forest Entomology: Ecology and Management (Coulson & Witter)
- Plants of the Pacific Northwest (Pojar), or similar local reference
- Trees of Seattle (Jacobson), or similar local reference
- Natural Vegetation of Oregon and Washington (Franklin), or similar local reference
- The Use and Significance of Pesticides in the Environment (McEwen)
- The Body Language of Trees (Mattheck)
- Trees (Coombes)
- Wild Neighbors: The Humane Approach to Living with Wildlife (HSUS)
- IPM World Textbook (Radcliff, online)
- The Tree Care Industry Association, formerly the National Arborist Association, is a public and professional non-profit organization for the arboriculture field. It has more than 2,000 member companies representing over a dozen countries. TCIA's Accreditation program certifies that tree care companies that have been inspected and accredited based on adherence to industry standards for performance and safety; maintenance of trained, professional staff; and dedication to ethics and quality in business practices. In addition, they provide safety and educational programs, guidelines for tree service operations, ANSI A300 tree pruning standards, and consumer resources.
- The International Society of Arboriculture, a non-profit organization, maintains a list of ISA Certified Arborists who have passed a written exam and demonstrated a basic level of knowledge in arboriculture. There are also additional classifications of certified arborists with Certified Arborist/Utility Specialist for those who work near power lines, and Certified Arborist/Municipal Specialist for those who deal mostly with community trees. Other certifications exist for Certified Tree Workers, and the highest level of certification, the Board Certified Master Arborist.
- The American Society of Consulting Arborists is an organization whose membership is exclusive to those with either a certain level of industry experience, plus higher educational experience or continuing education; some members may achieve a higher status by fulfilling the requirements to become a Registered Consulting Arborist. Consulting arborists generally specialize in the areas of ethics, law, land planning and development, and tree valuation, among others. Consulting arborists are often called on for legal testimony and report writing in various instances where a particular authority on trees is necessary for consequent actions.
- In the UK, the principal organisation representing arborists is the Arboricultural Association. The association maintain a register of consultants who have demonstrated a high level of technical arboricultural knowledge, and operate an Approved Contractor scheme. This scheme assesses both the technical competence and business practices of arboricultural contractors.
- The European Arboricultural Council is a European group of arboriculture organizations from various countries.
- Plant Amnesty is a public education and advocacy group, based in Seattle, dedicated to promoting proper pruning methods. Founded in 1987, Plant Amnesty became an international resource for arborists and their clients in the mid-1990s.
Arborists in literature
The protagonist in Italo Calvino's novel The Baron in the Trees lives life on the ground as a boy and spends the rest of his life swinging from tree to tree in the Italian countryside. As a young man he helps the local fruit farmers by pruning their trees.
Some noteworthy arborists include:
- Francis A. Bartlett – founded the world’s leading scientific tree and shrub care company in 1907.
- Franz Borsova – co-founder of the National Arborists Association of Australia.
- John Chapman – pioneering U.S. frontier nurseryman and orchardist, commonly known as Johnny Appleseed.
- Richard Essam – head of the Ontario Union of Arborists and Loggers.
- Sebastian Junger – author of Perfect Storm and War, before becoming a journalist, was an arborist in Massachusetts.
- Chuck Leavell – two-time recipient of the Georgia Tree Farmer of the Year award, and author of the children's book, The Tree Farmer. In 2006 Leavell was appointed by Governor Sonny Perdue to the Georgia Land Conservation Council. He is also an accomplished jazz pianist and keyboardist for the Rolling Stones.
- Liam McGough – a contestant on the British version of Big Brother
- Alex Shigo – the father of modern arboriculture.
- Cass Turnbull – founder of Plant Amnesty, a non-profit education and advocacy group, and author of pruning and gardening books.
- Benjamin White – a working arborist until injured in a fall from a tree, Benjamin White became an environmental activist, worked as bosun of the Sea Shepherd, and created the sea turtle costumes worn at the anti-WTO protests in Seattle during 1999.
- Mark Hartley - Actively involved in forming the Australian National Arborist Association and introducing Standards Australia AS 4373-1996. Mark was awarded the Award of Merit from International Society of Arboriculture - In recognition of service in advancing the principles, and practices of arboriculture. (This is the highest honor bestowed by the industry).
Large tree transplant Townsville, Australia
An Oregon arborist providing a slideshow presentation about tree care and pruning at a garden show in Portland, Oregon
A crew of arborists felling a tree in sections at Kallista, Victoria
Friendship Oak on the campus of Southeastern Louisiana University is hundreds of years old. Like other mature spreading oaks, Friendship Oak is maintained by arborists to prevent the limbs from growing into the ground.
Notes and citations
- American National Standards Institute Z.133- and International Brotherhood of Electrical Workers.
- Harris, Richard W., James R. Clark, and Nelda P. Matheny: Arboriculture Integrated Management of Landscape Trees, Shrubs, and Vines, third edition; Prentice-Hall, Inc. 1999.
- "Pruning Standards to Maintain Landscape Trees (3)". E. Thomas Smiley, Ph. D., Plant Pathologist and Bruce R. Fraedrich, Ph. D., Plant Pathologist; Bartlett Tree Research Laboratory.
- Alex Shigo pioneered tree-friendly pruning by Ron Sullivan; San Francisco Chronicle November 15, 2006.
- Common Law Branches Off Into New Directions; by Victor D. Merullo; Journal of Arboriculture 20(6): November 1994.
- Landscape Tree Appraisal by David P. Mooter, et al.; University of Nebraska–Lincoln Extension; March, 2004.
- Guide for Plant Appraisal, 9th ed; by the Council of Tree and Landscape Appraisers; International Society of Arboriculture; 2000.
- See also specific legal provisions for "tree theft" such as, for example, the Revised Code of Washington title 64.12.030 for Washington (State, USA) or similar state, provincial, or local statutes.
- Arboriculture and the Law in Canada by Julian Dunster and Susan Murray; International Society of Arboriculture; 1997.
- Arboriculture and the Law by Victor D. Merrullo; International Society of Arboriculture; 1992.
- Board Certified Master Arborist Application Booklet; International Society of Arboriculture, 2007
- Radcliffe's IPM World Textbook
- American Society of Consulting Arborists – Registered Consulting Arborist
- "The Seattle Times: Pacific Northwest Magazine". The Seattle Times.
- Berkeley Daily Planet – Friday March 10, 2006
- Chuck Leavell – Trees
- PlantAmnesty: Fearless Leader: OUR FOUNDER
- Thomas Janet, "The Battle In Seattle," Fulcrum Publishing, 2000.
- American Society of Consulting Arborists
- International Society of Arboriculture
- Tree Care Industry Association